Bing and plastic umbrella are trying to override the Firefox browser and I don't know how to block them
Plasticumbrella overrode the browser when an Application update came up which I thought was for my computer applications (Mac) so I deleted it in preferences and re-instated Firefox and rebooted but then Bing somehow took over?
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Start Firefox in Safe Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration is causing the problem.
- switch to the DEFAULT theme: "3-bar" menu button or Tools -> Add-ons -> Appearance
- do NOT click the "Refresh Firefox" button on the Safe Mode start window
https://malwarefixes.com/remove-plasticumbrella-malware-removal/ Remove Plasticumbrella - Malware Removal - MalwareFixes
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.