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Re:A timing attack with CSS selectors and JavaScript by clear_dg on Sunday October 07, 2018 @11:15AM (#18160947)
uMatrix can block frames and js requests on a domain/sub-domain level. afaik, it can't block at url level, if that's what you meant.

That said, uMatrix, from what I remember, uses the webRequest api which does work from urls. So if you know JS, you can always create an extension and add your own filter.

Re:A timing attack with CSS selectors and JavaScript by nerdponx on Sunday October 07, 2018 @04:18PM (#18162420)
To be clear, on the JS side I'm talking about providing whitelist-only access to things like the ambient light level, which is provided through a standardized browser API.