1726757 - Screen View size changes on some websites to large or small size and cannot be changed back

Status: RESOLVED WORKSFORME

(Core :: Layout, defect)

Description

[Benjamin Ertel]

Attachment: Screenshots.pdf

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Firefox/91.0

Steps to reproduce:

Device Used: Microsoft Surface Book with Windows 10

-Open Firefox

-Open new tab

-Go to specific website (e.g. Amazon)

Actual results:

The screen view changed automatically and cannot be changed back via the menu (See attached images: image one shows how the chosen size should look, image two shows how it actually does look for amazon)

Expected results:

The screen view should not change

Comment 1

[Benjamin Ertel]

This bug should have been resolved with the patch to 91.0.1 but acually started to show up after the patch on 17.8.2021.

It happens on some websites but not on all websites.

Thank you for taking a look at it!

Comment 2

[Daniel Holbert [:dholbert]]

Attachment: reporter's first screenshot (desired size/resolution)

Comment 3

[Daniel Holbert [:dholbert]]

Attachment: reporter's second screenshot (unexpectedly-changed size/resolution)

Comment 4

[Daniel Holbert [:dholbert]]

Thanks for the bug report. I've clipped out your screenshots and posted them directly as attachments, to make them a bit easier to see them and compare them.

A few questions:
(1) Just clarifying the issue -- it looks like the Firefox UI (toolbars/buttons etc.) grew by about ~3x, when you visited Amazon.com. Is that right? (That's quite odd; I've never experienced that.)

(2) In comment 1, are you saying that 91.0.1 was the first version where you encountered this issue?

(I'm guessing the patch you described was the top entry at https://www.mozilla.org/en-US/firefox/91.0.1/releasenotes/ , for bug 1704404. Though that bug and its followup bug 1727397 seem to be more about unexpected padding space, whereas in your screenshots here, all of the browser UI -- including e.g. text and icons and even the close button -- seem to have grown in size.)

(2) You mentioned that it happens on some sites in particular, e.g. Amazon. Does it always happen when visit Amazon? (the first time you visit after starting Firefox) Or I'm wondering if maybe it just happens randomly and it seems to be associated with certain sites but it's not clear?

(3) If you open the Firefox menu (the one that's open in your screenshots) and choose "More Tools" (near the bottom) and then "Customize Toolbar", and then click the "Density" button at the bottom of that customization screen, what's the value that it shows? (And if you change it, does the bug go away?)

(4) I'm wondering if this might be related to bug 1727397 which is fixed in version 93 (currently our beta release); if you wouldn't mind testing Beta at https://www.mozilla.org/firefox/channel/desktop/#beta and see if this is fixed there, that would help out as well.

Thanks again!

Comment 5

[Benjamin Ertel]

Hi Daniel,

regarding your questions:

(1): That's right. The whole UI grows really large when some websites are visited, for example "amazon.com" or "t-online.de" and cannot be changed back.

(2): Exactely. Yes i know, it is not the same bug but 91.0.1 was the first version where the bug was encountered.

(2): It does allways happen if a specific site is visited, for example amazon. It seems to be related with certain sites, not all sites lead to this behaviour. It does definitely not happen randomly. No matter how long you wait, after visiting the website, the UI changes.

(3): For density, it shows: "Normal". By changing it to "Touch", the UI changes a little bit but the bug does not go away.

(4):I tried out the Beta-Version ant tested "amazon.com" but the bug is still present.

I hope my answers will help fixing this bug. If you need more informations ore screenshots, feel free to ask.

Thank you!

Comment 6

[Benjamin Ertel]

Sorry, there is a small mistake in my first anwer!

Corrected:

(1): That's right. The whole UI grows really large when some websites are visited, for example "amazon.com" from "t-online.de" and cannot be changed back.

Comment 7

[Emilio Cobos Álvarez (:emilio)]

Hmm, that is really weird / fascinating. Even the browser UI seems to get bigger, is that right?

If not, perhaps you have a default zoom for that site somehow? Does it happen in a clean profile?

I can't reproduce this either... If it happens for you consistently, is there any chance you could try mozregression to narrow down what caused this? Thanks so much!

Comment 8

[Daniel Holbert [:dholbert]]

Attachment: testcase 1 (tentative)

One other request -- could you load this attached testcase and see if it triggers the issue?

I've just copied Amazon's HTML title, i.e. the thing displayed in the tab titlebar. I'm curious whether their title (and the umlaut character in particular, probably) is sufficient to trigger the issue. (Note that related bug 1704404 looks to have been triggered by special characters in tab titles.)

Comment 9

[Daniel Holbert [:dholbert]]

Attachment: testcase 1 (tentative, now with utf-8 charset), using the Amazon.de title

sorry, I was missing the meta charset tag which made that testcase slightly-bogus - here's a corrected version that you should use instead. (Probably won't make a difference.)

Comment 10

[Daniel Holbert [:dholbert]]

Attachment: testcase 2 (tentative): just an umlaut in title

I'm curious if this testcase (with the title being just an umlaut) is sufficient to trigger the bug, too.

Comment 11

[Daniel Holbert [:dholbert]]

Also, it would be great to know if you can reproduce in Nightly (available from https://nightly.mozilla.org/ ). It's possible this has already been fixed there. (Note that Nightly uses a separate profile folder from Firefox, so it won't mess with your existing Firefox installation or data, which is nice.)

Comment 12

[Daniel Holbert [:dholbert]]

Hi Benjamin - just a reminder, we could use some help from you to get closer to figuring out what's going on here.

(Specifically: do the attached testcases from my recent comments reproduce the issue for you? And, do you see the issue in Nightly? And, if Nightly is affected and you're up for a little more testing, mozregression (mentioned in Emilio's comment above) could help you to discover specifically which code-change was responsible for breaking it.)

Thanks!

Comment 13

[Benjamin Ertel]

Hi Daniel,

just saw your comment, thank you for the reminder.

Sorry for my late comment! I was quite bussy in the last couple of weeks.

@Emilio: No default zoom settings applied, it does also happen in a clean profile

(Testcase): I tried it and it does not trigger the issue, the UI keeps its size

(Nightly): The issue is fixed in Nightly. Everything is fine there with the UI size.

Does this mean the problem is fixed in firefox too in the near future?

Thank you!

Comment 14

[Daniel Holbert [:dholbert]]

Sorry, I'm just seeing comment 13.

(In reply to Benjamin Ertel from comment #13)

(Nightly): The issue is fixed in Nightly. Everything is fine there with the UI size.

Does this mean the problem is fixed in firefox too in the near future?

This is great news! Yes, that usually does indeed mean that Firefox release ends up being fixed shortly afterwards (usually within ~8 weeks, since Nightly and Beta each bake for 4 weeks before reaching release).

I'll tentatively close this as WORKSFORME based on your observation about this working properly in Nightly, but please reopen and/or add more info if you can still reproduce in any up-to-date release version.