Add simple FF userstyle manager
Using userChrome.css and userContent.css it is possible to do what most userstyle manager addons do. The only disadvantage is that it cannot be done live, you have to restart the browser. The `./update.sh` script is responsible for assembling the two `.css` files. The `userChrome.css` takes everything inside the `userChrome` folder and concatenates it. It also adds the correct header for the FF UI domain. The `userContent.css` works in a similar way, but here the file names are used to set the URL the style applies to.
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