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Default search engine keeps changing

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My "default" search engine keeps changing itself usually to Yahoo or Bing — I have to change it back sometimes 5+ times per day. I don't have "Provide search suggestions" checked; I've also unchecked all the other search choices under "One-click search engines". This issue is really becoming quite annoying.

My "default" search engine keeps changing itself usually to Yahoo or Bing — I have to change it back sometimes 5+ times per day. I don't have "Provide search suggestions" checked; I've also unchecked all the other search choices under "One-click search engines". This issue is really becoming quite annoying.

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You can check for recently installed suspicious or unknown extensions.

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.

  • Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
  • Do NOT click the Reset button on the Safe Mode start window

If you do not keep changes after a restart or otherwise have problems with preferences, see: