I'm using this on linux mint, and basically whenever i install it, it will work for a few hours. Then the next day when i try to load any page, it will fail. Even if I disconnect from the VPN it still fails. The only thing that works is to delete the entire extension and redownload it and log in, which takes too long.
Need to fix this issue, otherwise app unusable

Funciona, y funciona bien.

The best vpn, thanks to this now all my ecosystem is proton. One part that it sucks is in drive you just have 2 GB and that is not enough for me. But with the VPN in my opinion IS THE BEST VPN ADDON

Works well.
Used on my phone for a while, now switched from google chrome to Firefox exclusively at home and on my phone, works perfectly between my PC and my phone.
I have also just subscribed to their premium $20 per month plan.
Well worth it! I have used their emails and drive as well for a while now. Great product suite

Seems to work

Works as expected

critical bug can cause firefox to crash and freeze when enabled and will cause it to also instantly hang on start up of firefox. need to run in "-safe-mode" to disable proton.

The inability to setup profiles, even as a paid subscriber, makes this far less useful than it should be. When you want to bypass your country's censorship the last thing you want is a default connection to servers in your country. Yes, you can manually change it, but this rather undercuts the purpose and convenience that auto-connect brings. Fastest connection to not my country is in the desktop app and I want to see it here too.

works as expected...

The "take what you get" free server idea would be OK if it didn't corrupt one's browser language settings so that, for example, if one draws a Japanese server then one's browser language becomes Japanese and can't be reset--and yes, Firefox has default language control, but it doesn't work to reset the langauge. If one could at least choose preferred nations rather than having to accept the default picked by the Proton extension, life would be easier. Otherwise, one must disconnect totally from Proton VPN and reconnect later -- or do a quick study in Japanese, Chinese (apologies, Aifun Ltd), etc.!

(Re: ProtonVPN's response) -- I've used NordVPN and Surfshark in the past and I lever lost my language choice. Neither one changed nor corrupted my browser language as ProtonVPN does. Both are linguistically "transparent to the user". If ProtonVPN thinks loss of legibility is "proof" it is working and that illegible browser output that cannot be restored--even when their VPN service is turned off-- is a good trade-off, they're naively mistaken. Proton VPN's algorithm of an arbitrary node selection with hopes that one gets the right language "brass ring" on Proton's node merry-go-round leaves no choice but to give up their VPN protection. Proton could offer users a language preference option, but that seems outside their wherewithal, unlike other VPN providers.

Of course, Proton offers the choice of a paid "upgrade" to solve the loss of language problem. My "test drive" of free Proton VPN shows that it cannot ensure language autonymy; why would I pay to risk more poor performance?

(Again a 2/20/26 update, solicited by Proton:) Nothing new, better or improved. Same language corruption, same poor choices of 10 (Proton's lead-in still says "5") lands in their "take what you get and shut up!" node lottery in the brass ring grab that corrupts your set language --"proof that it's working...", says Proton. Oh, but you can opt for another bad choice by simply selecting "Change..." and waiting up to 10 minutes for another--likely poor--choice and hope it speaks your language. All this could be lessened if not done away with by allowing us freeloaders (who'd pay for this kind of performance and service?) to specify a language preference on signing up. Nope. Too complicated for Proton's team to implement.

So from me, still one star.

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Pretty great for all my uses and never had a problem connecting. Dropping one star because it's missing the favourite feature from the PC app, forcing me to scroll through the entire list of countries to find what I want instead of pinning my favourite to the top.

At least dozen of times literally, every week it freezes the connections and needs to be switched off. Sometimes it even needs the browser to be restarted. Encountered it already on the first day I started to use it, contacted CS, and learnt that everything was fine.
Other annoyances: requesting every few weeks to write a review.