Why can't i restore my default search engines?
My Firefox is broken. It keeps making me use yahoo and it won't let me reset the default search engines , the button is grey won't let me click it. It keeps switching my default search engine to something else and i don't know why it first started when i didn't mean to download something i thought i deleted it but it will not stop popping up and making me use safe finder and yahoo. My restore default search engine button won't work since i can't click it , now I'm just left with mobzilla support engine because i tried to delete the search engine that keeps popping up.
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Did you try reinstallation?
https://support.mozilla.org/nl/questions/962694
Check this out hope it helps.
You can rename/remove search.json.mozlz4 (and possible search.json, search-metadata.json, search.sqlite) in the Firefox profile folder with Firefox closed to rebuild the search engines registry.
You can use the button on the "Help -> Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page.
- Help -> Troubleshooting Information -> Profile Folder/Directory:
Windows: Show Folder; Linux: Open Directory; Mac: Show in Finder - https://support.mozilla.org/en-US/kb/Profiles
Firefox will rebuild the search.json.mozlz4 file from the builtin search engines.