zoom.minPercent not respected by layout in some cases, although the frontend correctly displays the expected zoom

NEW
Unassigned

Status

()

Core
Layout
P3
normal
23 days ago
6 days ago

People

(Reporter: Johannes Seldevall, Unassigned)

Tracking

57 Branch
Points:
---

Firefox Tracking Flags

(firefox-esr52 affected, firefox56 affected, firefox57 affected, firefox58 affected)

Details

Attachments

(1 attachment)

(Reporter)

Description

23 days ago
Created attachment 8922911 [details]
bf39b4aa78cc510df2b2820bc14e2ac7.mp4

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:57.0) Gecko/20100101 Firefox/57.0
Build ID: 20171026211016

Steps to reproduce:

I visit a website I never have visited before, it looks as if the website is zoomed out to 100%. But the zoom display says it's 150%. (the "zoom.minPercent" is 150%)

- I haven't made many changes in about:config
- The only addon I have install is uBlock Origin
- Using 57.0b.12 (64-bit)
- This didn't use to be an issue


Actual results:

When visiting a new website the zoom displays 150%, but despite having the value "zoom.minPercent" on 150% it looks as if the website is zoomed out to 100% (which it is). When zooming in the zoom changes from 100% to 160%, zooming out changes the value to 150% which can't be lowered. (see the GIF to see how it looks like - https://gyazo.com/bf39b4aa78cc510df2b2820bc14e2ac7)


Expected results:

The website should have been displayed with the zoom 150% as I've changed the min percentage websites can show (zoom.minPercent), which it also displays that it shows.
Please troubleshoot with Safe Mode: https://support.mozilla.org/kb/troubleshoot-firefox-issues-using-safe-mode
(Reporter)

Comment 2

23 days ago
(In reply to Kohei Yoshino [:kohei] from comment #1)
> Please troubleshoot with Safe Mode:
> https://support.mozilla.org/kb/troubleshoot-firefox-issues-using-safe-mode

I've used Firefox in Safe Mode (Add-ons disabled), the bug still appears to happen.
User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:58.0) Gecko/20100101 Firefox/58.0
Firefox: 58.0a1, Build ID 20171031220132

I have managed to reproduce this issue, using the steps provided in the description, on Windows 10 x64, Ubuntu 14.04 x64 and Mac 10.12.6 with the latest Firefox release (56.0.2) and latest Nightly (58.0a1) builds.
I went back as far as Firefox 16.0a1 and the issue is still reproducible, considering this I will assign a component to this issue in order to get the engineering team opinion.
Status: UNCONFIRMED → NEW
status-firefox56: --- → affected
status-firefox57: --- → affected
status-firefox58: --- → affected
status-firefox-esr52: --- → affected
Component: Untriaged → Panning and Zooming
Ever confirmed: true
OS: Unspecified → All
Product: Firefox → Core
Hardware: Unspecified → All
See Also: → bug 539417, bug 1356295
Most likely there's a mismatch between how the frontend and layout handle cases with zoom.minPercent > 100. Moving to layout since that side of the behaviour seems wrong to me (rendering at 100% zoom instead of respecting zoom.minPercent).
Component: Panning and Zooming → Layout
Summary: New websites aren't affected by zoom.minPercent → zoom.minPercent not respected by layout in some cases, although the frontend correctly displays the expected zoom

Updated

6 days ago
Priority: -- → P3
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