Bug 1424279 Limit search terms from about:addons to 100 characters r=rhelmer

MozReview-Commit-ID: 3BBXcsOVmqe

--HG--
extra : rebase_source : 155260fb842d1c7d3914e4144075bfc2d3a0df93

toolkit/mozapps/extensions/content/extensions.xul

@@ -251,7 +251,7 @@
             </toolbarbutton>
             <textbox id="header-search" type="search" searchbutton="true"
                      searchbuttonlabel="&search.buttonlabel;"
-                     placeholder="&search.placeholder2;"/>
+                     placeholder="&search.placeholder2;" maxlength="100"/>
           </hbox>
 
           <deck id="headered-views-content" flex="1" selectedIndex="0">