Injected stylesheet messes up fonts

[JC3]

This extension seems to inject a stylesheet into every page with a rule defined for the class .tv, which defines fonts and other things.

The consequence is that the fonts are messed up on websites with elements that have a "tv" class (there's quite a few, weirdly; and it's also not uncommon on pages with obfuscated source, two-letter combos are easy to hit). For example:

Or:

As you can see, it's pretty rough, heh. The only workaround is to disable the extension (which is a bummer because in general it's pretty great).

Any classes, IDs, rules, functions, and anything else that this extension exposes needs to be given more unique and/or namespaced names (e.g. PostItAll-1234-tv instead of tv, or whatever), so that it doesn't interfere with web sites.