In my case on Zoom, the issue (un)fortunately doesn't repro in a fresh profile; and actually, it doesn't reproduce in a new Firefox window in the same session, though it does reproduce in new-tabs in the same Firefox window where I've got it reproducing right now. The colorful text is being drawn using transparent characters with `-webkit-background-clip:text`. We are apparently using the wrong characters for the purpose of that background-clipping, but we do show the correct characters if I click and drag to select the transparent text. (Not entirely sure if this is a distinct issue or the same core problem; but in any case it seems ephemeral and similar to the other reports here, so I wanted to capture as much as I could while I've got it reproducing.)
Bug 1759891 Comment 19 Edit History
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In my case on Zoom, the issue (un)fortunately doesn't repro in a fresh profile; and actually, it doesn't reproduce in a new Firefox window in the same session, though it does reproduce in new-tabs in the same Firefox window where I've got it reproducing right now. The colorful text is being drawn using transparent characters with `-webkit-background-clip:text`. We are apparently using the wrong characters for the purpose of that background-clipping, but we do show the correct characters if I click and drag to select the transparent text, or if I un-tick the CSS rule for `color: transparent`. (Not entirely sure if this is a distinct issue or the same core problem; but in any case it seems ephemeral and similar to the other reports here, so I wanted to capture as much as I could while I've got it reproducing.)