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Enhancing contrast in Thunderbird 115.3.1 (64-bit) for Mac

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My Thunderbird updated to 115.3.1 (64-bit). Many of the graphical elements are hard to see. e.g. the arrows that show that a message is reply, etc. Is there any way to increase the contrast?

Searches pointed to a Theme Font and Size Changer extension but neither of the two versions shows as compatible.

I also looked for themes optimized for accessibility but didn't find any. If they exist, I'll try them.

My Thunderbird updated to 115.3.1 (64-bit). Many of the graphical elements are hard to see. e.g. the arrows that show that a message is reply, etc. Is there any way to increase the contrast? Searches pointed to a Theme Font and Size Changer extension but neither of the two versions shows as compatible. I also looked for themes optimized for accessibility but didn't find any. If they exist, I'll try them.

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Please post a screen shot. Thanks

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Couple of examples enclosed.