how to uninstall yahoo
Have tried several ways found on net to uninstall Yahoo
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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.
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 free to use malware scanners. Each works differently. If one program misses something, another may pick it up.