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Thunderbird 91: Problems with text rendering

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code65536

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Posts: 59
Joined: October 17th, 2004, 7:01 pm
Location: .us

Post Posted October 16th, 2021, 11:33 pm

My installation of Thunderbird updated itself from 78 to 91 today, and I immediately noticed blurriness in the folder and message list.

Specifically, in the previous version 78, text in the UI (toolbar, etc.) and text in the folder/message panes all had subpixel anti-aliasing.

In version 91, the text in the UI continue to have have subpixel anti-aliasing, but the text in the folder/message panes just have grayscale anti-aliasing.

Here's a screenshot illustrating the difference; the image on top is from TB78, and the one below is TB91.
Image

Here's a zoomed-in view; note that the anti-aliasing for all parts of the TB78 part of the image are "colorful", which is the tell-tale sign of subpixel anti-aliasing, whereas for the TB91 part, the anti-aliasing in the toolbar is "colorful", but the subject text is 100% grayscale.
Image

code65536

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Posts: 59
Joined: October 17th, 2004, 7:01 pm
Location: .us

Post Posted October 16th, 2021, 11:49 pm

Looks like Bug 1732583. Toggling "gfx.webrender.force-disabled" works around the issue.

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