Is there a way to specify a certain chunk within a custom css stylesheet for a browser to apply to different websites or URLs? For example, Google Chrome’s Custom.css or Firefox’s userContent.css can be modified to change the appearance of a website, but the changes will apply to every website you visit that share the same tags, id’s, classes, etc. Like includes or something?
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For Firefox, you can do this using https://developer.mozilla.org/en-US/docs/CSS/@document (needs a
-mozprefix at the moment, since it’s non-standard).