1956983 - back button goes to the wrong page (two pages back) in certain scenarios

Status: NEW

(Firefox for Android :: Browser Engine, defect)

Description

[dofficialgman]

User Agent: Mozilla/5.0 (Android 15; Mobile; rv:136.0) Gecko/136.0 Firefox/136.0

Steps to reproduce:

Back action frequently goes to an unexpected page (not the previous page) during certain scenarios (see attached linked video for an example, the back action doesn't go to the page I was previously on). https://photos.app.goo.gl/SXyTiYWoHTfyarPq5

Actual results:

Back button goes to wrong page

Expected results:

Back button goes to previous page

Comment 1

[Alexander]

+1
on 136.0 all working good
on 136.0.2 bug exists
realme 9 pro 5g, android 14.

i've made a duplicate, sorry
https://bugzilla.mozilla.org/show_bug.cgi?id=1957829

Comment 3

[Vasilica Tamas QA [:vtamas]]

Attachment: BackGesture.mp4

I was unable to reproduce this issue on Firefox Nightly 139 (2025-04-01), Firefox 138 beta 1, Firefox 137 and Firefox 136.0.2 on Realme C35 (Android 11) and Samsung S24 Ultra (Android 14) using both back gestures and system button.

Are you still experiencing this issue on the latest Firefox versions?

Comment 4

[dofficialgman]

Yes, I still experience the problem (on latest stable Firefox) and have for months.

This is the general set of steps I have done that always triggers the bug for me:

Open a new page (in this example a Google search page) and search for something.
Click a link in the search results.
Go back to the search results (this works).
Use the Google search box to search for something else.
Click a link in the search results.
Go back and observe that it goes back to the original search results, not the last page.

Comment 5

[Alexander]

totally agree. Follow the steps and got the same bug.
BTW i am trying on 136.0

Comment 6

[Alexander]

seems that 135.0.1 is ok, can you confirm?

Comment 7

[Vasilica Tamas QA [:vtamas]]

I hardly reproduced it once on Firefox Nightly 139 (2025-04-04) on Realme C35 (Android 11) device. No issue encountered on Firefox 138 beta 2, Firefox 137, Firefox 136.0.2 and Firefox 135.0.1

Are you experiencing this bug in each try? Or it is an intermittent one?
Could you please confirm if this bug reproduces also on Firefox 138 beta 2 and latest Firefox Release 137. Thanks!

Comment 8

[dofficialgman]

(In reply to Vasilica Tamas QA [:vtamas] from comment #7)

I hardly reproduced it once on Firefox Nightly 139 (2025-04-04) on Realme C35 (Android 11) device. No issue encountered on Firefox 138 beta 2, Firefox 137, Firefox 136.0.2 and Firefox 135.0.1
Are you experiencing this bug in each try? Or it is an intermittent one?

If the steps are followed that I outlined, the issue occurs with 100% consistency.

Could you please confirm if this bug reproduces also on Firefox 138 beta 2 and latest Firefox Release 137. Thanks!

Issue still occurs on latest 137 release. Nightly/beta versions untested, doubt anything has changed since this has been an issue for months.

Comment 9

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'Firefox for Android::Browser Engine' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.