I'm always surprised to read claims that Firefox is the same or better than Chrome.

I switched to Firefox recently and many sites don't quite work: for example the pull request popup menu on GitHub appears off screen so can't be clicked on; the "new post" panel in Discourse is obstructed by the keyboard; FastMail alert box buttons don't work, and many other such annoyances.

It can be used as a main browser but it does have problems. I wouldn't bother with it if it wasn't for the manifest v3 situation

I use GitHub frequently and have never came across that issue; can't speak for the other sites though. If you're sure it's not the website's fault I'd encourage you to submit feedback: https://webcompat.com/issues/new

There's an open issue about it, so hopefully github should fix it eventually. It's on firefox mobile

Firefox mobile is its own beast. I experience a whole host of issues on it, but have never had issues with Firefox on desktop. Only reason I use FF for Android is for uBlock, but it's so unreliable I'm dying for a better option...

These days desktop and mobile is kinda joined at the hip because users expect things like tabs and history to sync. So if Firefox has many problems on mobile to the point where users are actively deterred from using it, that hurts Firefox on the desktop as well.

I am regular and long time user of Fastmail in Firefox and I'm surprised at your report of issues in Firefox. Can you describe the steps to reproduce the issues you found?

Using the Android mobile app, create a Fastmail link and add it to your home screen. Open the app, try to block a sender - it asks you to confirm and it's not possible to press either buttons.

The same workflow works fine in Chrome.

Yep I can confirm that certainty doesn't seem to work in a reliable way in Firefox on Android. I could only get it to work by tapping the button several times. Either it's not responding quickly enough, or the input field only works if you tap in a specific spot. The general performance of Fastmail in Firefox on Android is quite poor as well -- despite it being fairly snappy in desktop Firefox on Linux/Windows. I use the native Fastmail app on Android which performs much better -- I presume it uses a version of Chrome under the hood.

My experience is that Chrome winds up being consistently slower than Firefox, and I’ve gotten multiple friends (who aren’t techies) to switch because they’ve tried it out and agreed that it was more performant.

> obstructed by the keyboard

You seem to be talking about the mobile version?

Yes I should have mentioned it's the mobile version