Similar behavior as seen in Bug 1978280 but with a different root cause. The tweaked sidebar toggle for Vertical Tabs seems to break browser chrome flow, perhaps same issue with alternative UI buttons if they contain similar attributes? Steps to reproduce: 1. Open Firefox in a fresh profile. 2. Enable Vertical Tabs. 3. Disable Vertical Tabs. 4. Close and relaunch Firefox. 5. Narrow the window width to it's minimum size. Actual results: The unified extensions button and the overflow menu button partially overlap when the window width is reduced to its’ maximum allowed size. Expected: unified extensions button and the overflow menu button don't overlap when the window width is reduced to its’ maximum allowed size.
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Similar behavior as seen in Bug 1978280 but with a different root cause. The tweaked sidebar toggle for Vertical Tabs seems to break browser chrome flow, perhaps same issue with other buttons if they contain similar attributes? Steps to reproduce: 1. Open Firefox in a fresh profile. 2. Enable Vertical Tabs. 3. Disable Vertical Tabs. 4. Close and relaunch Firefox. 5. Narrow the window width to it's minimum size. Actual results: The unified extensions button and the overflow menu button partially overlap when the window width is reduced to its’ maximum allowed size. Expected: unified extensions button and the overflow menu button don't overlap when the window width is reduced to its’ maximum allowed size.