User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:75.0) Gecko/20100101 Firefox/75.0

Steps to reproduce:

Two pixels on the bottom navbar border have a different color.

At first I noticed this in Windows, where these pixels are darker than the rest of the border, whereas in Linux they are brighter and slightly noticeable.

Actual results:

For some reason, two pixels have a different color than the rest of the border.

Expected results:

The whole border must be the same color.

Bugbug thinks this bug should belong to this component, but please revert this change in case of error.

Resetting severity to default of --.

This looks more like a Graphics issue than Layout to me; possibly a rendering artifact at the boundary between separately-painted tiles, or something like that?

Hi Andrey,

Would it be possible to attach the information from the "about:support" page? Just type about:support in the url bar and attach the information to this bug.

Also, if you wouldn't mind, could you check if you still see this in Firefox's nightly release (will install side-by-side) as I'm not able to reproduce this on Firefox 75.0 or our nightly release.

You can find the nightly release here: https://www.mozilla.org/en-CA/firefox/channel/desktop/

Thanks!
Kris

I have attached about:support info and comparisons for Windows and Linux. Yes, Nightly version for Linux doesn't have that problem, but Nightly version for Windows still does. It seems that the problem also depends on the size of the window, because when I compare them side by side it's now 3 pixels.

Thanks Andrey!! I was able to reproduce it now.

STR:

• Turn Webrender Off
• Switch monitor resolution to 1366x768
• Start firefox

Because this bug's Severity has not been changed from the default since it was filed, and it's Priority is P3 (Backlog,) indicating it has been triaged, the bug's Severity is being updated to S3 (normal.)

A user here says that the last good build (without dots) was 2017-05-29 and the first bad one was 2017-05-30.

https://www.reddit.com/r/firefox/comments/gj292g/weird_dots_in_the_ui/fqjbyvy/

Their information is in the duplicate bug 1637722.