When I'm using Firefox 35.0.1, strange characters appear on the tabs - sometimes it's little apostrophes that don't cause any problems. But when I open several tabs the delineations between tabs often become distorted to where you can't tell where one ends and the next begins. Also there are multiple Asian characters all jumbled over the English tab labels. Eventually it becomes unmanageable and I have to close the browser.

I have the same configuration - software, hardware, or OS, as I did four months ago when this started happening. I've tried uninstalling Firefox and re-installing new versions. And, my auto-update is enabled. I have McAfee Security Center as my anti-virus protection.