(I am not a lawyer)
The usual argument (e.g.) for warrant canaries being meaningful is that the (US) government has much less legal ability to compel speech (especially false speech) than to prohibit it. I don’t think any similar argument holds for private contracts; AFAIK they can require speech, and I don’t know whether anything is different if the required speech is known by both parties to be false. (The one relevant search result I found doesn’t say there’s anything preventing such a contract; Claude says there isn’t, but it could be thrown out on grounds of public policy or unconscionability.)
I would think this ‘canary’ still works, because it’s hard to imagine OpenAI suing, or getting anywhere with a suit, for someone not proactively lying (when silence could mean things besides ‘I am subject to an NDA’). But, if a contract requiring false speech would be valid,
insofar as this works it works for different reasons than a warrant canary
it could stop working, if future NDAs are written with it in mind
(Quibbles aside, this is a good idea; thanks for making it!)
As a counterpoint, I use Firefox as my primary browser (I prefer a bunch of little things about its UI), and this is a complete list of glitches I’ve noticed:
The Microsoft account login flow sometimes goes into a loop of asking me for my password
Microsoft Teams refuses to work (‘you must use Edge or Chrome’)
Google Meet didn’t used to support background blurring, but does now
A coworker reported that a certain server BMC web interface didn’t work in Firefox, but did in Chrome (on Mac) — I found (on Linux, idk if that was the relevant difference) it broke the same way in both, which I could get around by deleting a modal overlay in the inspector