Hi, I retested the issue without changing anything on default level from about:preferences (Global zoom feature) and also using an old build where global zoom feature has not yet been introduced and the issue still occurs. So, its not a regression from that changes, but I've marked as blocking bug 1590485 because I found this issue while testing the global zoom feature. Seems to be not a global zoom feature related issue. Thanks for the observation.
Bug 1611954 Comment 3 Edit History
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Hi, I retested the issue without changing anything on default level from about:preferences (Global zoom feature) and also using an old build where global zoom feature has not yet been introduced and the issue still occurs. So, its not a regression from that changes, but I've marked as blocking bug 1590485 because I found this issue while testing the global zoom feature. Seems to be not a global zoom feature related issue. I think this is not a recent regression since the issue is reproducible on Nightly 64.0a1 (2018-10-06) as well. Thanks for the observation.