[nilslindemann]

For just injecting CSS I prefer the Stylus addon.

[n_plus_1_acc]

I use uBlock origin for that.

[miroljub]

Thanks. I would've never thought about it. For a few fixes I need, installing a new extension would be an overkill.

[n_plus_1_acc]

It can also remove tracking parameters from URLs (no clearurls addon needed) and remove spam from Google and duckduxkgo results via https://github.com/quenhus/uBlock-Origin-dev-filter (no ublocklist needed)

[vesinisa]

How do you use uBlock to inject CSS?

[n_plus_1_acc]

`example.com##h1:style(background-color: blue !important)`

See https://github.com/gorhill/uBlock/wiki/Static-filter-syntax#... for the syntax.