Thanks for reporting. This issue is ultimately due to the padding we have on the toolbarbutton badges, and like Itiel mentioned, it is reproducible for various types of `.toolbarbutton-badge`. We ultimately have to restrict the size of the badges, so I'm not sure how actionable the 4 digit cutoff is. We'll also want to keep the padding for these badges as is to optimize for the Firefox badges. I think the actionable item here could be to make sure the toolbarbutton does not move when a badge reaches a certain size. I'd suggest a low priority (P5) for this issue, since we display the 3 digit count correctly
Bug 1714135 Comment 4 Edit History
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Thanks for reporting. This issue is ultimately due to the padding we have on the toolbarbutton badges, and like Itiel mentioned, it is reproducible for various types of `.toolbarbutton-badge`. We ultimately have to restrict the size of the badges, so I'm not sure how actionable the 4 digit cutoff is. We'll also want to keep the padding for these badges as is to optimize for the Firefox icon badges. I think the actionable item here could be to make sure the toolbarbutton does not move when a badge reaches a certain size. I'd suggest a low priority (P5) for this issue, since we display the 3 digit count correctly