Fix the least controversial jshint warnings

To install jshint, simply `npm install jshint` from the root
directory of the project. Then run like it like this:

    node_modules/.bin/jshint data/*.js

.gitignore

@@ -8,3 +8,4 @@ data/deployment.json
 *.xpi
 exported_graphs
 *.swp
+/node_modules

data/aggregate.js

@@ -1,3 +1,4 @@
+/* jshint moz: true */
 // Graph Visualization
 
 // Visualization of tracking data interconnections
@@ -50,7 +51,7 @@ aggregate.getBlockedDomains = function () {
   return Object.keys(userSettings).filter(function (domain) {
     return userSettings[domain] == 'block';
   });
-}
+};
 
 aggregate.getAllNodes = function () {
   var blockedDomains = aggregate.getBlockedDomains();
@@ -63,7 +64,7 @@ aggregate.getAllNodes = function () {
       name: domain
     };
   }));
-}
+};
 
 aggregate.getConnectionCount = function (node) {
   if (node.nodeType === 'blocked')
@@ -71,11 +72,11 @@ aggregate.getConnectionCount = function (node) {
 
   let connections = Object.keys(aggregate.nodeForKey(node.name)).length;
   return connections - 1 > 0 ? connections - 1 : 0;
-}
+};
 
 aggregate.nodeForKey = function (key) {
   var result = {};
-  var linkedNodes = new Array();
+  var linkedNodes = [];
 
   if (aggregate.nodemap[key]) {
     linkedNodes = aggregate.nodemap[key].linkedFrom.concat(aggregate.nodemap[key].linkedTo);
@@ -120,7 +121,7 @@ aggregate.connectionAsObject = function (conn) {
   }
   return conn;
 
-}
+};
 
 // Pass the list of connections to build the graph structure to pass to d3 for
 // visualizations.
@@ -167,7 +168,7 @@ const CACHEABLE = 13;
 // of false positives.
 aggregate.isDomainVisited = function isDomainVisited(domain) {
   return aggregate.recentSites.length && (aggregate.recentSites.indexOf(domain) > -1);
-}
+};
 
 
 function onConnection(conn) {
@@ -236,7 +237,7 @@ function onConnection(conn) {
       aggregate.trackerCount++;
     }
     // console.log('new target: %s, now %s nodes', targetnode.name, aggregate.nodes.length);
-    updated = true
+    updated = true;
   }
   // Create edge objects. Could probably do this lazily just for the graph view
   if (aggregate.edgemap[connection.source + '->' + connection.target]) {
@@ -291,13 +292,13 @@ function GraphEdge(source, target, connection) {
 }
 GraphEdge.prototype.lastAccess = function () {
   return (this.source.lastAccess > this.target.lastAccess) ? this.source.lastAccess : this.target.lastAccess;
-}
+};
 GraphEdge.prototype.firstAccess = function () {
   return (this.source.firstAccess < this.target.firstAccess) ? this.source.firstAccess : this.target.firstAccess;
-}
+};
 GraphEdge.prototype.update = function (connection) {
   this.cookieCount = connection.cookie ? this.cookieCount + 1 : this.cookieCount;
-}
+};
 
 // A graph node represents one end of a connection, either a target or a source
 // Where a connection is a point in time with a timestamp, a graph node has a  time range

data/dialog.js

@@ -1,3 +1,4 @@
+/* jshint moz: true */
 /* Dialog / Popup ===================================== */
 
 // dialog names (used as dialog identifiers)
@@ -118,7 +119,7 @@ function addDialogEventHandlers(modal, options, callback) {
       modal.close();
       callback(false);
     }
-  }
+  };
   document.addEventListener("keydown", keyDownHandler);
 
   modal.onClose(function () {

data/graph.js

@@ -1,3 +1,4 @@
+/* jshint moz: true */
 // Graph Visualization (one of 3 views: graph, clock, and list). This is way
 // too heavyweight for mobile right now.
 
@@ -70,7 +71,7 @@ function onInit() {
   vizcanvas.setAttribute('viewBox', [0, 0, width, height].join(' '));
   // console.log('graph::onInit end');
   document.querySelector(".filter-display").classList.remove("hidden");
-};
+}
 
 function onRemove() {
   // var startTime = Date.now();
@@ -81,7 +82,7 @@ function onRemove() {
   resetCanvas();
   document.querySelector(".filter-display").classList.add("hidden");
   // console.log('it took %s ms to remove graph view', Date.now() - startTime);
-};
+}
 
 function onReset() {
   onRemove();
@@ -161,23 +162,24 @@ function charge(d) {
 }
 
 function colourHighlightNodes(highlight) {
+  var i;
   var watchedSites = document.querySelectorAll(".watched");
   var blockedSites = document.querySelectorAll(".blocked");
   if (highlight.watched) {
-    for (var i = 0; i < watchedSites.length; i++) {
+    for (i = 0; i < watchedSites.length; i++) {
       watchedSites[i].classList.add("watchedSites");
     }
   } else {
-    for (var i = 0; i < watchedSites.length; i++) {
+    for (i = 0; i < watchedSites.length; i++) {
       watchedSites[i].classList.remove("watchedSites");
     }
   }
   if (highlight.blocked) {
-    for (var i = 0; i < blockedSites.length; i++) {
+    for (i = 0; i < blockedSites.length; i++) {
       blockedSites[i].classList.add("blockedSites");
     }
   } else {
-    for (var i = 0; i < blockedSites.length; i++) {
+    for (i = 0; i < blockedSites.length; i++) {
       blockedSites[i].classList.remove("blockedSites");
     }
   }
@@ -243,7 +245,7 @@ function initGraph() {
     });
     nodes.each(function (d, i) {
       // `this` is the DOM node
-      this.setAttribute('transform', 'translate(' + d.x + ',' + d.y + ') scale(' + (1 + .05 * d.weight) + ')');
+      this.setAttribute('transform', 'translate(' + d.x + ',' + d.y + ') scale(' + (1 + 0.05 * d.weight) + ')');
       this.setAttribute('data-timestamp', d.lastAccess.toISOString());
       if (d.nodeType === 'site' || d.nodeType === 'both') {
         this.classList.add('visitedYes');
@@ -317,7 +319,7 @@ function addCircle(selection) {
     .append('circle')
     .attr('cx', 0)
     .attr('cy', 0)
-    .attr('r', graphNodeRadius["graph"])
+    .attr('r', graphNodeRadius.graph)
     .classed('site', true);
 }
 

data/infobar.js

@@ -48,7 +48,7 @@ global.initMap = function initMap(mapcanvas, mapDocument) {
       if (currentRequest === info.host) {
         callback((request.status === 200) ? JSON.parse(request.responseText) : false);
       }
-    }
+    };
     request.send(null);
   }
 
@@ -271,7 +271,7 @@ global.initMap = function initMap(mapcanvas, mapDocument) {
   }, false);
 
 
-}
+};
 
 
 /* Info Panel Tabs ======================================== */

data/lightbeam.js

@@ -1,3 +1,4 @@
+/* jshint moz: true */
 (function (global) {
 
 'use strict';
@@ -66,7 +67,7 @@ global.elem = function elem(name, attributes, children) {
         }
       });
     }
-  } catch (e) {
+  } catch (err) {
     console.log('attributes: not what we think they are: %o', attributes);
   }
   if (children) {
@@ -113,7 +114,7 @@ global.switchVisualization = function switchVisualization(name) {
     defaultVisualization: name
   });
   // console.log('it took %s ms to switch visualizations', Date.now() - startTime);
-}
+};
 
 function resetAdditionalUI() {
   // toggle off info panel
@@ -150,7 +151,7 @@ global.startSharing = function startSharing(askForConfirmation, callback) {
   } else {
     callback(true);
   }
-}
+};
 
 /****************************************
  *   Format date string
@@ -164,7 +165,7 @@ global.formattedDate = function formattedDate(date, format) {
     formatted = dayInWeek + ", " + formatted + " " + ((d.getHours() == 12) ? 12 : (d.getHours() % 12)) + ':' + d.toLocaleFormat('%M') + ['AM', 'PM'][Math.floor(d.getHours() / 12)];
   }
   return formatted;
-}
+};
 
 
 global.singularOrPluralNoun = function singularOrPluralNoun(num, str) {
@@ -172,7 +173,7 @@ global.singularOrPluralNoun = function singularOrPluralNoun(num, str) {
     num = parseFloat(num);
   }
   return (num !== 1) ? str + "s" : str;
-}
+};
 
 /****************************************
  *   update Stats Bar
@@ -185,6 +186,6 @@ global.updateStatsBar = function updateStatsBar() {
   document.querySelector(".top-bar .date-gathered").textContent = dateSince;
   document.querySelector(".top-bar .third-party-sites").textContent = aggregate.trackerCount + " " + singularOrPluralNoun(aggregate.trackerCount, "THIRD PARTY SITE");
   document.querySelector(".top-bar .first-party-sites").textContent = aggregate.siteCount + " " + singularOrPluralNoun(aggregate.siteCount, "SITE");
-}
+};
 
 })(this);

data/list.js

@@ -1,10 +1,10 @@
-'use strict';
+/* jshint moz: true */
-
 // List Visualization
 
 // Display data in tabular format
 
 (function (visualizations, global) {
+"use strict";
 
 var list = new Emitter();
 var breadcrumbStack = [];
@@ -482,7 +482,7 @@ function sortTableOnColumn(table, n) {
 
     tbody.appendChild(preFrag);
     tbody.appendChild(frag);
-  }
+  };
 }
 
 function resetCanvas() {
@@ -511,7 +511,7 @@ function getSelectedRows() {
   // returns selected rows as an Array
   return getAllRows().filter(function (item) {
     return item.querySelector('.selected-row:checked');
-  })
+  });
 }
 
 // Event handlers
@@ -539,16 +539,17 @@ function setUserSetting(row, pref) {
 
 // selectAllRows should only select VISIBLE rows
 function selectAllRows(flag) {
+  var i;
   // apply flag to ALL rows first
   var rows = document.querySelectorAll(".body-table tr");
-  for (var i = 0; i < rows.length; i++) {
+  for (i = 0; i < rows.length; i++) {
     rows[i].querySelector(".selected-row").checked = flag;
     highlightRow(rows[i], flag);
   }
   // and then exclude all the hidden rows
   if (document.querySelector(".hide-hidden-rows")) {
     var hiddenRows = document.querySelectorAll(".list-table .body-table tr[data-pref=hide]");
-    for (var i = 0; i < hiddenRows.length; i++) {
+    for (i = 0; i < hiddenRows.length; i++) {
       hiddenRows[i].querySelector(".selected-row").checked = false; // makes sure the hidden rows are always unchecked
       highlightRow(hiddenRows[i], false);
     }
@@ -645,7 +646,7 @@ function initializeHandlers() {
       });
       showFilteredTable(lastFilter);
       selected = getAllRows().filter(function (row) {
-        return wereSelected.indexOf(row.dataset.name) > -1
+        return wereSelected.indexOf(row.dataset.name) > -1;
       })
         .map(function (rowToSelect) {
           rowToSelect.querySelector("[type=checkbox]").checked = true;

data/parseuri.js

@@ -16,7 +16,7 @@ function parseUri(str) {
   });
 
   return uri;
-};
+}
 
 parseUri.options = {
   strictMode: false,

data/svgdataset.js

@@ -20,7 +20,7 @@ function svgdataset(elem) {
       // act as getter
       value = elem.getAttribute(dataKeyToAttr(key));
       try {
-        get
+        get;
         return JSON.parse(value);
       } catch (e) {
         return value;

data/ui.js

@@ -1,3 +1,4 @@
+/* jshint moz: true */
 (function (global) {
 // Bunch of utilities related to UI elements.
 const graphNodeRadius = {
@@ -10,7 +11,7 @@ global.graphNodeRadius = graphNodeRadius;
 /* Convert a NodeList to Array */
 global.toArray = function toArray(nl) {
   return Array.prototype.slice.call(nl, 0);
-}
+};
 
 /**************************************************
  *   For accessibility:
@@ -94,7 +95,7 @@ global.confirmStartSharing = function confirmStartSharing(askForConfirmation, el
       elmClicked.checked = false;
     }
   });
-}
+};
 
 global.confirmStopSharing = function confirmStopSharing(elmClicked) {
   stopSharingDialog(function (confirmed) {
@@ -107,7 +108,7 @@ global.confirmStopSharing = function confirmStopSharing(elmClicked) {
       elmClicked.checked = true;
     }
   });
-}
+};
 
 function toggleBtnOnEffect(toggleBtn) {
   toggleBtn.querySelector(".toggle-btn-innner").classList.add("checked");
@@ -135,7 +136,7 @@ function downloadAsJson(data, defaultFilename) {
     a.target = '_blank';
     document.body.appendChild(a);
     a.click();
-  }
+  };
   reader.readAsDataURL(file);
 }
 
@@ -184,12 +185,12 @@ global.getZoom = function getZoom(canvas) {
     console.log('Caller: %o', caller);
     return null;
   }
-}
+};
 
 global.setZoom = function setZoom(box, canvas) {
   // TODO: code cleanup if both cases use basically the same code
   canvas.setAttribute('viewBox', [box.x, box.y, box.w, box.h].join(' '));
-}
+};
 
 
 /* Scroll over visualization to zoom in/out ========================= */
@@ -244,15 +245,16 @@ function checkWithinZoomLimit(targetSvg, zoomType, zoomLimit) {
 // Check to see if the viewBox of the targeting svg is within the limit we define
 // if yes, zoom
 function zoomWithinLimit(scrollDist, targetSvg, zoomInLimit, zoomOutLimit) {
+  var i;
   if (scrollDist >= 1) { // scroll up to zoom out
-    for (var i = 1; i <= scrollDist; i++) {
+    for (i = 1; i <= scrollDist; i++) {
       if (checkWithinZoomLimit(targetSvg, "out", zoomOutLimit)) {
         svgZooming(targetSvg, (1 / svgZoomingRatio));
       }
     }
   }
   if (scrollDist <= -1) { // scroll down to zoom in
-    for (var i = scrollDist; i <= -1; i++) {
+    for (i = scrollDist; i <= -1; i++) {
       if (checkWithinZoomLimit(targetSvg, "in", zoomInLimit)) {
         svgZooming(targetSvg, svgZoomingRatio);
       }
@@ -341,13 +343,13 @@ global.toggleLegendSection = function toggleLegendSection(eventTarget, legendElm
     elmToToggle.classList.add("hidden");
     eventTarget.textContent = "Show";
   }
-}
+};
 
 global.toggleVizElements = function toggleVizElements(elements, classToggle) {
   toArray(elements).forEach(function (elm) {
     elm.classList.toggle(classToggle);
   });
-}
+};
 
 
 
@@ -361,7 +363,7 @@ global.selectedNodeEffect = function selectedNodeEffect(name) {
   if (g.currentVisualization.name == "list") {
     resetHighlightedRow();
   }
-}
+};
 
 global.connectedNodeEffect = function connectedNodeEffect(name) {
   // console.log(name);
@@ -380,7 +382,7 @@ global.connectedNodeEffect = function connectedNodeEffect(name) {
     }
   }
 
-}
+};
 
 // for Graph & Clock
 global.addGlow = function addGlow(name, type) {
@@ -398,7 +400,7 @@ global.addGlow = function addGlow(name, type) {
       .classed(type, true);
 
   });
-}
+};
 
 global.calculateGlowSize = function calculateGlowSize(gNode, viz) {
   var glowProps = {};
@@ -416,7 +418,7 @@ global.calculateGlowSize = function calculateGlowSize(gNode, viz) {
   glowProps.cy = siteNode.getAttribute("cy") || 0;
 
   return glowProps;
-}
+};
 
 // for Graph
 global.resetAllGlow = function resetAllGlow(type) {
@@ -434,7 +436,7 @@ global.resetAllGlow = function resetAllGlow(type) {
       connectedGlow.parentNode.removeChild(connectedGlow);
     }
   }
-}
+};
 
 // for List
 global.resetHighlightedRow = function resetHighlightedRow() {
@@ -442,7 +444,7 @@ global.resetHighlightedRow = function resetHighlightedRow() {
   if (preHighlighted) {
     preHighlighted.classList.remove("selected-connected-row");
   }
-}
+};
 
 /**************************************************
  *   Singular / Plural Noun
@@ -452,12 +454,12 @@ global.singularOrPluralNoun = function singularOrPluralNoun(num, str) {
     num = parseFloat(num);
   }
   return (num > 1) ? str + "s" : str;
-}
+};
 
 function updateUIFromPrefs(event) {
-  if ("contributeData" in event && event["contributeData"]) {
+  if ("contributeData" in event && event.contributeData) {
     var toggleBtn = document.querySelector(".share-btn");
-    if (event["contributeData"]) {
+    if (event.contributeData) {
       toggleBtn.querySelector("input").checked = true;
       toggleBtnOnEffect(toggleBtn);
     } else {
@@ -466,7 +468,7 @@ function updateUIFromPrefs(event) {
     }
   }
   if ("defaultVisualization" in event) {
-    global.currentVisualization = visualizations[event["defaultVisualization"]];
+    global.currentVisualization = visualizations[event.defaultVisualization];
     if (global.currentVisualization) {
       console.log("Got viz");
     } else {
@@ -475,7 +477,7 @@ function updateUIFromPrefs(event) {
   }
 
   if ("defaultFilter" in event) {
-    aggregate.currentFilter = event["defaultFilter"];
+    aggregate.currentFilter = event.defaultFilter;
     document.querySelector('a[data-value=' + aggregate.currentFilter + ']')
       .dataset.selected = true;
     document.querySelector(".filter-display header").textContent =

lib/connection.js

@@ -1,3 +1,4 @@
+/* jshint moz: true */
 // Connection object. This module may try to do too many things.
 //
 // Convert an HTTP request (channel) to a loggable, visualizable connection
@@ -45,7 +46,7 @@ exports.getAllConnections = function getAllConnections() {
   console.log("got", connBatch.length, "buffered connections",
     ss.storage.connections.length, "persisted connections");
   return ss.storage.connections.concat(connBatch);
-}
+};
 
 function excludePrivateConnections(connections) {
   return connections.filter(function (connection) {
@@ -80,7 +81,7 @@ function getDomain(host) {
 Connection.getDomain = getDomain; // make it part of what we export
 Connection.reset = function () {
   connBatch.length = 0;
-}
+};
 
 // Get subdomain (e.g., foo from foo.example.com)
 function getSubdomain(host) {
@@ -88,14 +89,14 @@ function getSubdomain(host) {
   return host.slice(0, host.length - domain.length);
 }
 
-function Connection() {};
+function Connection() {}
 
 // subject comes from events.on("http-on-modify-request");
 Connection.fromSubject = function (subject) {
   var conn = new Connection();
   conn.restoreFromSubject(subject);
   return conn;
-}
+};
 
 // Functions below may include legacy code from the first version of Collusion.
 // Find the page the URL was originally loaded from to determine whether this
@@ -142,8 +143,9 @@ Connection.prototype.restoreFromSubject = function (event) {
   var source = channel.referrer;
   var target = channel.URI;
   var targetDomain = getDomain(target.host);
+  var tab = null;
   try {
-    var tab = getTabForChannel(channel);
+    tab = getTabForChannel(channel);
   } catch (e) {
     console.log('EXCEPTION CAUGHT: No tab for connection');
     tab = null;
@@ -154,7 +156,7 @@ Connection.prototype.restoreFromSubject = function (event) {
   var browserSpec = browserUri && browserUri.spec;
   var browserDomain = null;
   try {
-    var browserDomain = browserUri && getDomain(browserUri.host);
+    browserDomain = browserUri && getDomain(browserUri.host);
   } catch (e) {
     // chances are the URL is about:blank, which has no host and throws an exception
     // console.error('Error getting host from: ' + browserUri.spec);
@@ -236,7 +238,7 @@ Connection.prototype.restoreFromSubject = function (event) {
   this.isPrivate = isPrivate;
   this._sourceTab = tab; // Never logged, only for associating data with current tab
   // console.error((sourceVisited ? 'site: ' : 'tracker: ') + sourceDomain + ' -> ' + targetDomain + ' (' + browserUri.spec + ')');
-}
+};
 
 // Connection - level methods (not on instances)
 // This may be supported by the addon-sdk events.on now.

lib/main.js

@@ -1,3 +1,5 @@
+/* jshint moz: true */
+/* global exports, require */
 "use strict";
 
 const events = require("sdk/system/events");
@@ -66,4 +68,4 @@ exports.main = function (options, callbacks) {
     return;
   }
   tabs.open(data.url(loadURL));
-}
+};

lib/persist.js

@@ -1,3 +1,5 @@
+/* jshint moz: true */
+/* global console, require, exports */
 // All writes to storage and upload logic in the addon process goes here.
 "use strict";
 
@@ -11,7 +13,7 @@ var storage = ss.storage;
 const STORAGE_KEYS = [
   "blockmap",
   "connections",
-]
+];
 
 // Upload logic.
 function serializeConnections(connections) {
@@ -20,7 +22,7 @@ function serializeConnections(connections) {
     version: '1.1',
     uploadTime: Date.now(),
     connections: connections
-  }
+  };
   return JSON.stringify(exportSet);
 }
 
@@ -63,7 +65,7 @@ exports.storeConnections = function storeConnections(connections) {
   if (prefs.contributeData) {
     upload(connections);
   }
-}
+};
 
 // Reset stored state, including preferences
 exports.reset = function reset() {
@@ -72,7 +74,7 @@ exports.reset = function reset() {
   prefs.contributeData = false;
   prefs.defaultVisualization = "graph";
   prefs.defaultFilter = "daily";
-}
+};
 
 // Initialize all of our storage
 if (!storage.connections) {

lib/shared/menuitems.js

@@ -1,3 +1,5 @@
+/* jshint moz: true */
+/* global require, exports */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
@@ -142,7 +144,9 @@ function addMenuitems(self, options) {
 
       // add unloader
       let unloader = function unloader() {
-        menuitem.parentNode && menuitem.parentNode.removeChild(menuitem);
+        if (menuitem.parentNode) {
+          menuitem.parentNode.removeChild(menuitem);
+        }
         menuitems[menuitems_i] = null;
       };
       menuitemNS(self).unloaders.push(function () {
@@ -218,17 +222,17 @@ function tryParent(parent, menuitem, before) {
   return !!parent;
 }
 
-function insertBefore(parent, insertBefore) {
+function insertBefore(parent, before) {
-  if (typeof insertBefore == "number") {
+  if (typeof before == "number") {
-    switch (insertBefore) {
+    switch (before) {
     case MenuitemExport.FIRST_CHILD:
       return parent.firstChild;
     }
     return null;
-  } else if (typeof insertBefore == "string") {
+  } else if (typeof before == "string") {
-    return parent.querySelector("#" + insertBefore);
+    return parent.querySelector("#" + before);
   }
-  return insertBefore;
+  return before;
 }
 
 function MenuitemExport(options) {

lib/shared/policy.js

@@ -1,3 +1,5 @@
+/* jshint moz: true */
+/* global require, exports */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

lib/shared/unload+.js

@@ -1,3 +1,5 @@
+/* jshint moz:true */
+/* global require, console, exports */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
@@ -38,7 +40,7 @@ var Unloader = exports.Unloader = Class({
       callback = function () {
         container.removeEventListener("unload", windowRemover, false);
         origCallback();
-      }
+      };
     }
 
     // Wrap the callback in a function that ignores failures

lib/tab/events.js

@@ -1,3 +1,5 @@
+/* jshint moz: true */
+/* global require, exports */
 // Simple onTab handler to figure out what tab a connection corresponds to.
 'use strict';
 

lib/tab/utils.js

@@ -1,3 +1,4 @@
+/* jshint moz: true */
 // ChromeTab
 //
 // This is a module for getting the tab a channel is loaded in, from the channel
@@ -84,14 +85,14 @@ function getLoadContext(aRequest) {
     var loadContext = aRequest.QueryInterface(Ci.nsIChannel)
       .notificationCallbacks.getInterface(Ci.nsILoadContext);
     return loadContext;
-  } catch (ex) {
+  } catch (err1) {
     // fail over to trying the load group
     try {
       if (!aRequest.loadGroup) return null;
 
       var loadContext = aRequest.loadGroup.notificationCallbacks.getInterface(Ci.nsILoadContext);
       return loadContext;
-    } catch (ex) {
+    } catch (err2) {
       return null;
     }
   }

lib/ui.js

@@ -1,3 +1,5 @@
+/* jshint moz:true */
+/* global require, exports, console */
 'use strict';
 
 const {
@@ -46,13 +48,13 @@ exports.onForWorker = function (eventname, handler) {
   } else {
     console.log('no uiworker to subscript to order');
   }
-}
+};
 
 exports.emitForWorker = function (eventname, obj) {
   if (uiworker) {
     uiworker.port.emit(eventname, obj);
   }
-}
+};
 
 // Begin tab handlers. These are for sidebar functionality, which is not
 // present yet.
@@ -86,8 +88,9 @@ ContentPolicy({
     origin: origin
   }) {
     // ignore URIs with no host
+    var topLevelDomain;
     try {
-      var topLevelDomain = Connection.getDomain(location.host);
+      topLevelDomain = Connection.getDomain(location.host);
     } catch (e) {
       // See Issue 374: https://github.com/mozilla/lightbeam/issues/374
       // if there is no host, like in about:what, then the host getter throws
@@ -152,13 +155,13 @@ function attachToLightbeamPage(worker) {
 
   function onPrefChanged(event) {
     if ("contributeData" in event) {
-      prefs.contributeData = event["contributeData"];
+      prefs.contributeData = event.contributeData;
     }
     if ("defaultVisualization" in event) {
-      prefs.defaultVisualization = event["defaultVisualization"];
+      prefs.defaultVisualization = event.defaultVisualization;
     }
     if ("defaultFilter" in event) {
-      prefs.defaultFilter = event["defaultFilter"];
+      prefs.defaultFilter = event.defaultFilter;
     }
   }