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Firefox switches search to bing

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Doesn't work!!! DON"T have dsengine.js only have channel-prefs in folder! STILL GET BING SEARCH!!

C:\Program Files\Mozilla Firefox\defaults\pref\ C:\Program Files (x86)\Mozilla Firefox\defaults\pref\

You can look for a file named dsengine.cfg in the main Firefox program folder.

C:\Program Files\Mozilla Firefox\ C:\Program Files (x86)\Mozilla Firefox\

Delete the dsengine.js and dsengine.cfg files when present.

Doesn't work!!! DON"T have dsengine.js only have channel-prefs in folder! STILL GET BING SEARCH!! C:\Program Files\Mozilla Firefox\defaults\pref\ C:\Program Files (x86)\Mozilla Firefox\defaults\pref\ You can look for a file named dsengine.cfg in the main Firefox program folder. C:\Program Files\Mozilla Firefox\ C:\Program Files (x86)\Mozilla Firefox\ Delete the dsengine.js and dsengine.cfg files when present.

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That are old and outdated instructions.

Start Firefox in Troubleshoot Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration or if userChrome.css/userContent.css is causing the problem.

  • switch to the Default System theme: "3-bar" menu button or Tools -> Add-ons -> Themes
  • do NOT click the "Refresh Firefox" button on the Troubleshoot Mode start window

If clearing the "Restore Default Search Engines" on the "Settings -> Search" page doesn't work, try to rename/remove search.json.mozlz4 in the Firefox profile folder with Firefox closed to rebuild the search engines registry.

You can use the button on the "Help -> More Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page (Root directory).

Firefox will rebuild search.json.mozlz4 from the built-in search engines.