can't change default search engine
I try to change the default search engine in the search bar (to Google) by following your instructions, including by deleting all the other available options, but every time I re-open Firefox, all the other search engines have re-appeared and the default engine is Yahoo, not Google.
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Please try using https://addons.mozilla.org/en-US/firefox/addon/searchreset/
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 or otherwise make changes.
- https://support.mozilla.org/kb/Safe+Mode
- https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
If you do not keep changes after a restart then see: