I cannot reproduce this, but I also do not have a high dpi screen. It is probably the xul layout being bad scaling handling html images, which I have seen before. This one is a little bit surprising though because the `moz-icon:` request specifies a size of 16 https://searchfox.org/comm-central/rev/2392baf95c8a9513a39f70e123779d12a0872376/mail/base/content/widgets/mailWidgets.js#1732 , but I guess the actual image may be larger. If it is what I suspect, then just changing the parent to html (or just wrapping it in a `div`) works to fix it. A cleaner solution would be to change the whole `attachmentcell-content` structure to html (and its semantics can be improved along the way). I could fix this, but I would just need someone to test it with a high dpi monitor to be sure its actually working.
Bug 1730334 Comment 2 Edit History
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I cannot reproduce this, but I also do not have a high dpi screen. It is probably the xul layout being bad scaling html images, which I have seen before. This one is a little bit surprising though because the `moz-icon:` request specifies a size of 16 https://searchfox.org/comm-central/rev/2392baf95c8a9513a39f70e123779d12a0872376/mail/base/content/widgets/mailWidgets.js#1732 , but I guess the actual image may be larger. If it is what I suspect, then just changing the parent to html (or just wrapping it in a `div`) works to fix it. A cleaner solution would be to change the whole `attachmentcell-content` structure to html (and its semantics can be improved along the way). I could fix this, but I would just need someone to test it with a high dpi monitor to be sure its actually working.