Thanks for spotting this. I think this change was probably accidental, but looking at our telemetry and thinking about it now, I think it makes sense for the "full page" button to the primary button in that button group (full page is used ~30% more). This means it would get styled differently, receive initial focus and - if we can manage it - follow the same rules for appearing on the left vs. right in windows vs. macos as our other button groups. This will mean a mismatch with the extension, but an intentional one.
Bug 1886843 Comment 2 Edit History
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Thanks for spotting this. I think this change was probably accidental, but looking at our telemetry and thinking about it now, I think it makes sense for the "full page" button to be the primary button in that button group (full page is used ~30% more). This means it would get styled differently, receive initial focus and - if we can manage it - follow the same rules for appearing on the left vs. right in windows vs. macos as our other button groups. This will mean a mismatch with the extension, but an intentional one.