The advice in the thread isn't "never connect to protonmail using Chrome." It's "don't use Chrome".
100% agree. Firefox is so good now, there's really no excuse.
So, I would just use Safari, except that as a dev, I need the vastly superior dev tools, extensions, and customizability of Chrome and FF.
So now I have to juggle browsers, trying not to get burned by Google, burned in a whole different way by FF, and trying to get things done in Apple's "no preference settings for you, because Apple's preferences are all that matter" design ethos.
Furthermore, we're discussing a major con of using Chrome in this thread, so I'd be happy to take a minor trade-off or two to avoid that (especially if that trade-off is partly down to Google crippling their own service perf-wise in non-Google browsers).
What kind of sites are taxing Firefox other than the well-known offenders? Given you're on Pro and I've no issues with an Air, it's likely a GPU issue that could be remedied with some config tweaks.
I hate when people say this, of course there are valid reasons why not to use Firefox. For example Firefox can't play videos smoothly on my hardware (yes, this issue has been reported), that's a dealbreaker for me.
That's what they claimed, not what they discovered. What they discovered was that Chrome was sending emails created in a specific webmail client to a translation service. Language detection is done client-side; text is only sent to the translation service if the client decides it's in the wrong language.
https://www.bleepingcomputer.com/news/software/mozilla-anger...
Perhaps you are angry because it doesn't send your DNS requests in the clear to Google's 8.8.8.8 service? Perhaps you are angry because you don't like encrypted communication protocols?
Off the top of my head, forced telemetry (even if you turn it off in about:settings some stuff gets reported back to Mozilla); Pocket and Sponsored Tiles, the former sends Mozilla the URL and form data for every site you visit, the latter has complete access to your browsing history so it can show you "relevant info"; Adobe DRM and Encrypted Media Extensions (some people don't like any DRM in their browser, I don't have an issue if it's trustworthy but you're asking so I'm listing); and a minor, easily corrected nitpick but they went back to Google as their default search engine. My problem with that is every update (so far) ignores user settings and changes it back. This can lead to unexpected unwanted searches via Google.
More generally, if any of these things actually offend you, I'm sorry to tell you but you're not the audience for a web browser—after all, general web browsing is far, far worse. Every website you visit gets your IP address and your user agent string. Ooooh noooo.