Is there any way to only apply the general.platform.override preferences to certain top-level domains?
Title pretty much says it all. To join meetings with Webex I have to override the platform to a supported platform, but I don't want every website using navigator.platform to think I am using windows for obvious reasons.
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Try this extension that seems to override oscpu and platform:
Does the extension work for you since you marked the reply as helpful ?
No it does not appear to work. If worst comes to worst I will just write a greasemonkey script or something.
When I enable the extension then I see this data via browserspy.dk (see screenshot; I'm on 32 bit Linux), so you would merely have to enable the extension when you want to spoof the platform and keep it disabled normally as it works by default and supports a whitelist to disable spoofing (you want the opposite), so maybe contact its developer and ask if it is possible to support your use case.
Note that this extension might not work properly if you use "Resist Fingerprinting".
Modified by cor-el
Oh, it works now. I didn't restart firefox after I installed it. I think that is a good solution for the time being.
Thanks for confirming that it works. There can always be a difference between a simple test and an actual use case with a specific website.