Running in dev edition by default

package.json

@@ -112,10 +112,10 @@
     "start": "npm run test:manual",
     "test": "npm-run-all -n test:unit # test:func",
     "test:func": "npm-run-all -pr test:func:*",
-    "test:func:selenium-mocha": "FIREFOX_BINARY=${FIREFOX_BINARY:-nightly} ADDON_ZIP=./dist/jestr_pioneer_shield_study-$npm_package_version.zip GECKODRIVER_URL=http://127.0.0.1:4444 mocha test/functional/ --bail --full-trace",
+    "test:func:selenium-mocha": "FIREFOX_BINARY=${FIREFOX_BINARY:-firefoxdeveloperedition} ADDON_ZIP=./dist/jestr_pioneer_shield_study-$npm_package_version.zip GECKODRIVER_URL=http://127.0.0.1:4444 mocha test/functional/ --bail --full-trace",
     "test:func:start-geckodriver-server": "geckodriver -vv 1> test/results/logs/geckodriver.log 2> test/results/logs/geckodriver.errors.log",
     "test:manual": "npm-run-all -pr test:func:start-geckodriver-server test:run-firefox",
-    "test:run-firefox": "FIREFOX_BINARY=${FIREFOX_BINARY:-nightly} ADDON_ZIP=./dist/jestr_pioneer_shield_study-$npm_package_version.zip GECKODRIVER_URL=http://127.0.0.1:4444 node run-firefox.js",
+    "test:run-firefox": "FIREFOX_BINARY=${FIREFOX_BINARY:-firefoxdeveloperedition} ADDON_ZIP=./dist/jestr_pioneer_shield_study-$npm_package_version.zip GECKODRIVER_URL=http://127.0.0.1:4444 node run-firefox.js",
     "test:unit": "NODE_ENV=test karma start",
     "watch": "echo \"Watch is disabled since Pioneer Opt-in add-on needs to be available in the empty profile and web-ext thus is not an option\" # concurrently 'webpack --watch' 'web-ext run'"
   }

web-ext-config.js

@@ -10,7 +10,7 @@ const defaultConfig = {
     overwriteDest: true,
   },
   run: {
-    firefox: process.env.FIREFOX_BINARY || "nightly",
+    firefox: process.env.FIREFOX_BINARY || "firefoxdeveloperedition",
     browserConsole: true,
     startUrl: ["about:debugging"],
     pref: [