Add an @-moz-document block to all styles

[Timvde]

This makes the styles compatible with extension ssuch as reStyle and
theoretically slightly improves performance, since styles are more
narrowly applied.

[Madis0]

I don't know how official that syntax is, but let's use the comment section as suggested by the reStyle author, also let's apply the namespace too - #127

[Timvde]

I'm first merging in some other styles, then fix everything in one go. That's probably less work than updating all the branches at once.

The namespace should be irrelevant when using @-moz-document blocks, and I'm not sure how multiple namespaces would interfere. What's the advantage of changing the comment section?

[Madis0]

What's the advantage of changing the comment section?

reStyle compatibility, it would show them in a nice manager UI.