Browser version: 31.0.0
32-bit or 64-bit browser?: 64-bit
Problem URL: Any web page containing a .gif image; any .gif image opened through File > Open file
Browser theme (if not default): Default
Installed add-ons: None, clean profile
Installed plugins: (about:plugins): None, clean profile
If possible, please include the output of help->troubleshooting information (as text):
I've found an issue with Pale Moon v31 on Linux consuming a large amount of CPU whenever a .gif image is loaded on the active tab. Switching to a tab that doesn't have a .gif image on it returns the Pale Moon process to idle. This happens on any website with a .gif image loaded, and also occurs when opening a .gif image through File > Open file. Both static and animated .gif images trigger this issue. .png, .jpg, and .svg images don't trigger the issue. I haven't specifically tested any other image formats.
As I type this post, Pale Moon is using 70% of a thread on a Core-i7-4800MQ processor. When testing on a freshly-installed Ubuntu 22.04 virtual machine it caused the VM to completely saturate one core when a .gif was loaded in the active tab.
This appears to be an issue specifically with the Linux build as I could not replicate the high CPU use in a Windows VM. I used a clean browser profile with no add-ons when testing.
Let me know if there is any additional testing you need me to do to help track down this bug.