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Cannot reset Firefox.

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.
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
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