Same for me, although on Firefox Nightly. It's so annoying. For me, it does stop if I close the Play Store about 3 times in a row. It comes back after a while, but at least I can get a few hours or relief.

It's happening both on my Samsung Galaxy S23 Ultra and Samsung Galaxy Tab S10+ (both on Android 15). It happened after the last update to Firefox nightly. Once it's fixed, I guess I'll just stop updating the app for a while.

Have you tried rolling back to a prior version? I'm seriously considering doing this and reinstalling with a former APK version.

I resolved it on my phone by doing this. I am running the latest nightly.

1. activate debug mode by settings, about, tap icon until you see the toast for enabling debug
2. settings - nimbus experiments - (scroll to bottom) - tap enable custom review prompt - tap control

This disables that experiment which I believe is what is causing the issue. At least, disabling it resolved the issue on my phone. I will note that in the secret settings I also disabled the tab manager "enhancements" just in case that is somehow relevant but I doubt it is.

It has been happening with me too on FF Beta for about 2 days, probably since the last update.

I have tried setting my Homepage to "Last tab", and when opening the browser that way (provided there is an open tab), it doesn't open Google Play Store. However , when opening a new homepage tab, it still forces Google Play Store on my screen. I thought Google Play was to blame until I saw this thread.

> settings - nimbus experiments - (scroll to bottom) - tap enable custom review prompt - tap control

The solution above solved the issue for me.

Thank you! I will try this (nimbus experiments - (scroll to bottom) - tap enable custom review prompt - tap control) and see how it goes.

And I agree that I don't think the tab manager enhancements is the issue as I disabled that before this was happening.

That worked! Thank you so much!

This is tracked in a bug https://bugzilla.mozilla.org/show_bug.cgi?id=1992436 It was also reported on this site: https://support.mozilla.org/en-US/questions/1539506