Firefox: tabs containing a single image sometimes show generic icon instead of thumbnail

Posted by ??O????? on Super User See other posts from Super User or by ??O?????
Published on 2010-04-17T23:12:36Z Indexed on 2010/04/17 23:14 UTC
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Filed under:

firefox-3.5

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images

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thumbnails

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Icons

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tabs

My version of Firefox is 3.5.9, but I've had this issue since single-image tabs started showing a thumbnail of the contained image.

Typically, a tab containing a single image will use a thumbnail of the image as the icon before the tab title. Sometimes, though, this icon will be the generic “shaded sphere on blank page” (or perhaps whatever your theme defaults to). I'm guessing this happens whenever height or width is larger than 1024, but I seem to recall (perhaps erroneously) exceptions to this rule. Anyway, hopefully someone will know the definite answer to:

Why does this happen?

Examples

Images showing thumbnails

Wikipedia/Natalie Portman #1 (600×887)
Wikipedia/Natalie Portman #2 (789×1024)

Images not showing thumbnails

Wikipedia/BMW series 3 cars (1276×338)
Wikipedia/Greek temple (2414×1740)

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