Bruce, your problem might be a scripting problem, i.e., JavaScript running amok and unchecked on various sites. Perhaps triggered by internal changes in Firefox and/or the switch to a different default search engine. If you don't already have a way to control the execution of JavaScript in your browser, I'd recommend installing the NoScript extension. It's high maintenance in that every single page you visit you have to allow/disallow the Javascript that would otherwise run automatically on the page. This is a lot of bother, but personally I wouldn't browse without it, it's a common sense precaution against malicious (or annoying) scripts. You might be surprised the extent to which JavaScript runs in your browser without your knowledge, but such a utility will clue you in. So if you're not using something like this, it could help you narrow the possibilities for the cause of your problem.
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