I just stumbled upon a few repos on Gitub for injecting custom CSS and JS into web pages that are loaded into your browser: dotcss and dotjs. Not to take away anything from the developers but GreaseMonkey has been around for a long time and works with both Firefox and Chrome whereas dotjs does not. Ditto for Stylish. I remember using both of them in Firefox a long time ago (5-6 years ago).
If dotcss and dotjs are provable better than GreaseMonkey and Stylish I’ll be impressed but as it is, they look like they require a web server, a bunch of Ruby code and a Rakefile (a.k.a. build/Makefile). Seems like overkill for a bit of extra convenience.
A criticism of GreaseMonkey is that after editing you need to republish it:
GreaseMonkey user scripts are great, but you need to publish them somewhere and re-publish after making modifications. With dotjs, just add or edit files in
I don’t think I’ve encountered this problem. My scripts were saved in some random folder and then I just reloaded the page. No need to publish them anywhere else. Same with Stylish.
Running multiple web servers is definitely overkill. If you’re going to override the JS/CSS of a website, I suggest using GreaseMonkey and Stylish instead.