STR: (Win7_64, Nightly 43, 32bit, ID 20150830030224, new profile, HWA off) 0. Open http://example.org/ 1. Adjust the windows height to be a bit larger than "Edit this bookmark" popup's height 2. Move window to the bottom of screen 3. Click star button in toolbar to open "Edit this bokmark" popup menu 4. Click "Show all boorkmarks folder" arrow to show all bookmarks folder 5. Click "Show all tags" arrow to show all tags 6. Click "Hide" arrow to hide all tags 7. Click "Hide" arrow to show all bookmarks folder Result: "Edit this bookmark" popup menu is very high, and if you'll open it in another tab, it of course will have the same height Expectations: It should restore its normal height Note: It's very easy to reproduce on HiDPI.

I can't reproduce on nightly nor Firefox 45 on Linux 1920x1080. Is it still happen on your machine?

(In reply to Fred Lin [:gasolin] from comment #1) > I can't reproduce on nightly nor Firefox 45 on Linux 1920x1080. Is it still happen on your machine? Please show me a screencast and I'll determine where you're doing wrong step [OR] follow the steps directly.

Can reproduce on Mac though :)

looks similar to bug 814565

Regression range may be https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=9d2a7a8ca1c7&tochange=582d4c67b3a7.

Managed to reproduce this on Windows 7 x32 on the latest release(45.0.2) and latest Nightly(48.0a1). Based on comment 5, removing the "regressionwindow wanted" keyword.

Forward duping to 1247824.