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This makes me think that there could be similar bugs in the browser, when it JIT-compiles or optimizes Javascript code. That could be used to take control of the whole browser/OS if used in an add-on/extension (given that it has sufficient privileges).

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There have been similar bugs in browser JITs that allow websites to escape the sandbox - usually incorrect optimisations that cause the JIT to elide bounds checks when it can't safely do so, probably since those are the easiest to exploit.

There's actually a fair number of security researchers looking at browser-level exploits like those in JIT (c.f. pwn2own). My colleague Chris Rolhf co-authored a cool study on attacking JIT: https://www.nccgroup.trust/us/about-us/resources/jit/

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