Affected versions

• Firefox 84.0b4
• Firefox 85.0a1

Affected platforms

• macOS 11.1
• Windows 10
• Ubuntu 20.04

Steps to reproduce

1. Launch Firefox
2. Load this GIF page
3. Print preview the page and play with Orientation and Scale settings

Expected result

• The GIF is rendered

Actual result

• Sometimes, the GIF fails to render

Regression range

• Not a regression, see Bug 1659413

Additional notes

• The issue can be seen in the following attachment

Suggested severity

• S3

:csasca, if you think that's a regression, then could you try to find a regression range in using for example mozregression?

Catalin, can you still reproduce this? (I can't, but I'm not sure I have the right setup.)

Also: if you can reproduce, maybe we should dupe this to bug 1659413 and reopen that bug? The two bugs have the same STR/symptoms as far as I can tell.

(It looks like bug 1659413 was closed in September 2020 as WORKSFORME because we thought it wasn't reproducible anymore (bug 1659413 comment 8 - 9), and then Catalin was able to reproduce 2 months later in November 2020 and filed this bug as a result instead of reopening the original bug. I think a new bug [this one] would make sense if we really think it was fixed and then broke again, but it's not clear to me that it really was fixed; it seems like maybe it was just difficult/rare-to-reproduce.)

Seems that it is not reproducible anymore either on my side. Tried on 103.0 and playing with the settings worked fine.

Thanks! I'm going to dupe this to bug 1659413 then, and I'll add a note over there to indicate that we reproduced it after that bug was closed but think it's WFM at this point.