Search engine resets (sometimes only)

I want to add an additional search engine (StartPage SSL) and set it as your default search engine. This method works. Even after closing and re-opening Firefox.
Sometimes, not always. (1 or 2 days) after the entry of search engine is part and Amazon.com (first entry) is again the default search engine (all other settings are still in place).
In my Firefox profile, entry in the searchplugins folder is always there. The entries in the prefs.js are also here:
user_pref ("browser.search.defaultenginename", "Startpage (SSL) '");
user_pref ("browser.search.selectedEngine', 'Startpage (SSL)');

Removal of the 'search.json', ' search - metadata.json "and"formhistory.sqlite"did not help.
Clues?

Thanks in advance!

Hi again,

It seems that the extension "Add search bar" the cause of the problem. The extension renames the files of .undefined e.g. duckduckgo.xml to duckduckgo.xml.undefined search engine.

After uninstalling the extension, search engines remain active as they should.

Tags: Firefox

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