Annoying Firefox Problem?

Every time my Firefox loads to my homepage it says that it is missing additional plugins, but when I click to see what plugins are missing, it says I have all the latest versions. Also, when I visit some websites, I noticed that the font has changed, and I definitely have not switched any of my settings. Any idea as to what is going on? Thanks. :)

Answers:    reinstall firefox...
yea uninstall it and download it again
:)
and install
;o
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