Fenix: Bottom navigation bar shows up while scrolling

[AndiLeni]

Since the last update, the navigation bar (at the bottom on my device) randomly shows up while scrolling down. Then the screen is frozen for a few seconds and scrolling is not possible.

Steps to reproduce

Go to a random website and try scrolling up and down. This bug does not seem to appear at specific events.

Expected behavior

The navigation bar should only show up when scrolling up.

Actual behavior

While scrolling down the navigation shows up and freezes the screen.

Device information

• Android device: LG G8s Thinq
• Fenix version: 82.1.1 (Build #2015770923)

[aleblanc]

Same problem on LG G8s Thinq, the top location bar is shows up and the scroll freeze.

[sskodje]

Same problem on LG G7 Thinq. It prevents scrolling and is extremely annoying. Disabling "scroll to hide toolbar" does not fix the problem. The same thing happens, just that the navigation bar does not move when it happens. It happens also with navigation bar on bottom.

[AndiLeni]

There are a lot of similar comments on the play store page.
This issue should be resolved as soon as possible, since it makes the browser unusable.

Related to #16235

[liuche]

Are you seeing this on Nightly? Any ideas @Mugurell about what this could be, or if it's related to some of the gestures work?

[Mugurell]

Thank you for your reports!
Could you please share an example of a website you've seen this happening on?
Also a short video detailing the issue?
Being able to reproduce exactly the issue you're encountering would help us greatly.

[Mugurell]

Are you seeing this on Nightly? Any ideas @Mugurell about what this could be, or if it's related to some of the gestures work?

I think these reports are for the just updated release channel but the issues are probably present on Beta and Nightly also.
These could be indeed caused by some recent pan-zoom changes but should probably only happen on particular websites.
Will work with QA to try and reproduce / get a regression range.

[Mugurell]

I think I reproduced the issue (including the page "freezing") on support.mozilla.org

video

In the first part of the video it's seen that the toolbar does show up if scrolling on that carousel. This is current expected behavior - if a panning gesture is handled by the website we will show the toolbar.
But then the page "freezes" with the panning gesture not scrolling the website or animating the dynamic toolbar.

[AndiLeni]

@Mugurell
Thanks for taking care of the problem.

You are right, this issue is also present in the nightly version which is available on the play store.

I could not recognize a pattern on which sites the issue occures. It seems to happen at random (at least to me).
If you need help with testing feel free to reach out to me.

[AndiLeni]

@Mugurell
I just noticed, that this issue does not appear after restarting my device.
The problem appears after browsing for several minutes and gets worse the longer I use the browser.

[sskodje]

Here's a recording of scrolling down wikipedia at around one swipe per second on an LG G7. It seems to happen more often if you don't scroll continiously, and it happens on every webpage i've visited since the last update. Every time the nav bar pops up, it stops scrolling.

[DeanKertai]

Seeing the same thing on my LG G8 Thinq. Firefox version 82.1.1

[AndiLeni]

Two other issues with probably the same problem:

16295

16280

[aleblanc]

Probably the same problem : #16337
NB: Firefox Focus have not the touch / swipe problem

[AndiLeni]

@Mugurell
Any update for this issue?
It seems like many users face this problem currently.

[Mugurell]

Hello,
Indeed we are seeing more reports of this issue but it's still not clear what triggers it.
If this is easily reproduced by you can you please also try on GVE(geckoview-example.apk) and report back if you see it also happening there?
That is a stripped down version that should eliminate some possible reasons for this.

[AndiLeni]

@Mugurell I could not reproduce the issue in the GVE app.

[meson11]

Same here on oneplus 6. This should be high priority. I see many reports on google play store and this is maximum anoying. It is on every website and not only shows up at scrolling down, also when the website has elements to swipe horizontally. Seems that there is freezing something.

[08scoffman]

I just switched from iPhone to LG V50 and I have this exact same problem. Scrolling just freezes at times. It seems like it's an issue specifically with Firefox on LG phones. Very annoying.

[AndiLeni]

Two more issues facing this problem.

16530

14527

@Mugurell Can we somehow help narrow down the problem?

[peter-vasut]

I have noticed you mentioned #14527. If it's the same problem, try looking into this post and check versions I mention there to see, if your issue started to happen at the same time. I think I found first bad version.

[AndiLeni]

@peter-vasut
I reverted back to 81.1.5, which is the last version that works fine for me.