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You can replace the ChromeOS bootloader with upstream Coreboot and use SeaBIOS or edk2 payloads to turn it into a generic x86 laptop and install Linux.

Can you recommend any good guides for doing so?

uMatrix hasn't been updated in 4+ years, or is gorhill (or someone) distributing an updated version outside the addon stores?

uMatrix[0] (discontinued/archived in 2021)[1] and uBlock Origin (UBO)[2] are both by Raymond Hill/@gorhill.. he said he can only afford the time to continue with one and chose the latter. I'm guessing GP meant UBO. (UBOlite is also by @gorhill, but it's constrained by the browser)

[0]: https://addons.mozilla.org/en-US/firefox/addon/umatrix/

[1]: https://news.ycombinator.com/item?id=27602118

[2]: https://addons.mozilla.org/en-US/firefox/addon/ublock-origin...

No I meant uMatrix. It might not have been updated since 2021 but it didn't need any active development, it was perfect in my eyes. It was still available as an extension.

uBlockOrigin Lite. It's nowhere near as powerful but it'll help.

Edit: Sorry you said Matrix. I don't think so.