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Good extensions and Bad extensions
(sh.itjust.works)
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this post was submitted on 28 Aug 2023
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Enter
about:processesin the address bar.There's a speedometer icon next to the extensions row which will monitor resource usage for 5 seconds. There's a wealth of information.
cool tip!
cool!!
The answer to your actual question is really complicated though, and very difficult to know for any given extension.
Take ublock for example, it needs to examine every element on every page, which is generally "bad", but it's going to remove resource hungry ads, which is "good". The good part won't show up in about:processes.
That said, browsers (supported by modern cpus) are so insanely good at examining elements that you just won't notice the performance hit of a few dozen ms.
Problems only really arise when you encounter bugs.
It doesn't tell you how much resources each extension uses though, only all extensions in aggregate