Firefox repeatedly shuts down
This is happening a couple of times a week. I'm online maybe 15 to 20 hours a week. My search engine pref for DuckDuckGo is always lost, which makes me suspicious that since it always defaults to Yahoo, as if They don't like me using my preferred search engine.
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Type about:addons<enter> in the address bar to open your Add-ons Manager. Hot key; (<Control> [Mac=<Command>] <Shift> A)
In the Add-ons Manager, on the left, select Extensions. Remove “ Yahoo “ Anything.
Also remove SafeSearch, SearchAssist Incognito, FileConverter Addon, SearchLock, DiscreteSearch, WebSearch, Findwide Search Engine, securedsearch
Now do the same in the computer’s Programs Folder.
Windows: Start > Control Panel > Uninstall Programs. Mac: Open the Applications folder. Linux: Check your user manual.
Also, You may have ad/mal-ware. Further information can be found in this article; https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware?cache=no
Run most or all of the listed malware scanners. Each works differently. If one program misses something, another may pick it up.