The extension looks the part but has usability issues that need managing manually.

The main usability issue is that if you're connected to a VPN server and the computer goes into sleep mode then later resumes, the connection isn't refreshed/handled properly, effectively blocking traffic until you manually disconnect/reconnect. Occasionally this issues causes the GUI to become unresponsive too, requiring the extension itself to be restarted.

There's also no feedback given on the connection quality/speed of the server you're currently connected to. If it starts to feel slow, it requires manually moving to another server; there's no automatic transfer to a better equivalent server within the same country.

Not a negative mark on the extension per se - but it's worth noting that there's a growing list of websites that will detect you using a VPN (likely through matching your IP against IPs known to belong to Proton/etc.), making VPN usage for 'general' anonymous browsing more and more frustrating.

Proton VPN itself works well and provides lots of protections and connection configuration; it's just the extension that has a few issues really.

UPDATE 2026-09-07: Still a solid 4 stars. It would be 5 stars except that I regularly need to reboot the extension. This week I had to reboot the whole browser. When I contacted support as instructed in the reply below, they were dismissive and didn't try to get to the bottom of the issue.

ORIGINAL REVIEW: I need to reboot the extension whenever I switch wifi networks or else every few days. I routinely keep about:addons open so I can turn the extension off and on again. When I click the extension icon in the toolbar in this state, it just shows me a loading spinner. Besides this hiccup, the extension works great. (I am a subscriber.)

Please add an option to connect to last.

Thanks for providing a free version. Much appreciated. Wish I could pay... hopefully in the future. Unfortunately, it does not work for me on my phone :( postmarketOS on Linux ARM device.

Gostaria de um modo reverso no tunelamento dividido, pois preciso do VPN para apenas alguns sites.

Fora isso, muito bom.

Unstable connection from time to time

yet to test it, wait for the 2nd part of the review.

Works nice if you have a paid subscription. Though, would be wonderful to implement reverse version of the split-tunneling, when only sites specified are routed through the VPN.

E.g. if I'm ok with revealing my ip to most of the sites I visit, or I already route all the home network traffic through a local Proton server, but I want to completely hide my location from selected few sites. For them I'd like Firefox to automatically route the connection through a secure-core network. Currently it is only available when you manually connect and disconnect the extension as needed, and I often forget to do so.

Otherwise, a very useful extension

Great extension.
BUT, at every FF start, I cannot access any pages without switching the extension off and on again. Then it works perfectly.
Having profiles and Netshield would be a great addition. :).

add kill switch function!!!

Loses connection after a few minutes

Unfortunately quite frequent reconnections, visible on the popup, which I quickly turned off.
The super-fast connection at browser start or after standby or hibernation should be emphasized positively in any case. Clearly better than the Windows app by a large margin.
If you need Killswitch, you have to use the app for the operating system, the browser extension does not have that.
Split tunneling also works very well: Now I don't always have to switch browsers for my online banking page, for example.