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Cannot reset Firefox.

Time:December 10
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When I start Firefox, it comes up with Yahoo, NOT with the Firefox default. If I try to reset Firefox, I get the "Well this is embarassing" response, and cannot reset. I have gone to the Control Panel and deleted Firefox, and then downloaded and re-installed FIrefox from the Mozilla Foundation site, and still the problem persists. I cannot get rid of Yahoo.
As an aside note, Chrome is working OK. When I start up Chrome, I automatically open four tabs. From time to time, Chrome opens a fourth tab ... and it is Yahoo. I can go to Settings and delete the fourth tab, and everything is OK for a while, but eventually the fifth tab pops up again, and I have to delete it again. Don't know if these are related problems, but I don't believe in coincidence.
I use WebRoot security, and have scanned my PC and removed any and all threats. As far as WebRoot is concerned, my PC is clean.
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You can check for recently installed suspicious or unknown extensions.
Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.
*Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
*Do NOT click the Reset button on the Safe Mode start window
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes