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I know the Stylus and Stylish (not recommended) browser extensions that can re-style a given website (basically by customizing CSS).

In this comment, the author states this can be done via "user stylesheets".

How is it possible to use "user stylesheets" to modify the style of www.example.com and a different style for www.example2.com?

Is it something that can be done without requiring a third-party browser extension, if so, how/where in the browser options should we add our custom CSS?

Basj
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  • This is not a standard feature of many ( if any ) browsers afaik - perhaps this might be of interest https://davidwalsh.name/firefox-user-stylesheet or this https://www.lostsaloon.com/technology/using-a-custom-stylesheet-in-a-web-browser/ ~ this latter link suggests that ALL modern browsers allow this .... – Professor Abronsius Nov 30 '19 at 15:21
  • @RamRaider Thank you for your comment. The link seems outdated. I'm on Chrome, and there is no `User StyleSheets` folder (*"Depending on the browser version and OS this could vary but check the configuration folder on your system under the folder /Default/User StyleSheets/. Also if there is no file named Custom.css then you will need to create one inside the folder User StyleSheets/."*) – Basj Nov 30 '19 at 16:25

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This seems to be deprecated nowadays:

https://codereview.chromium.org/66383005/

Remove the concept of user stylesheets.
-The support for this has been removed from Chromium already.
This is now just deleting dead code.
...

Basj
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