A substantial amount of modern Internet infrastructure relies on the fact that major actors are behaving in good faith. This isn't a chain of escalation anyone would benefit from going down.
The surveillance companies have started us down the path of bad faith by nonconsentually tracking us via protocol and implementation bugs that leak identifying information. IMO Firefox et al need to keep working towards a better-specified JS runtime without these security vulns, so that when the layperson complains about big tech surveillance an easy answer is "Stop using Chrome".
For firefox this is nearly impossible because of the different quirks it has in its javascript/layout engine. It might be easier to do with all the chromium forks, but it's unknown how the proprietary bits in chrome affect browser behavior. At worst they can use something like have obfuscated code (eg. widevine L3) for attestation.
