Clicking the menu in the attachment toggles the appearance of the green arrow, but does not actually open the menu. Occasionally I can see a flash of something menu-shaped. dustin@hopper ~ $ ls -al tmp/firefox/firefox-bin -rwxr-xr-x. 1 dustin dustin 208600 Jul 27 11:23 tmp/firefox/firefox-bin dustin@hopper ~ $ tmp/firefox/firefox-bin --version Mozilla Firefox 56.0a1

After a restart (and upgrade to the Jul 27 11:23 version, I assume) the menu works fine.

This still occurs for me on build 20170728100358. Restart, Refresh and new profile, don't work. Tried on both Arch and Ubuntu Artful with i3wm.

I am using i3wm as well - maybe that's related?? The menu is working for me for today's update.

It sometimes works. As in it will work once and then not again for half an hour. Tested it in gnome on the same machine. It works fine. On reddit, there is someone with AwesomeWM (another tiling WM), who has the same problem. Could it be related to the tiling?

It works when running a composite manager like Compton.

Can confirm. It works when you use a composite manager. Is there a way without a composite manager?

Confirmed. When running FF Nightly x64 Linux 7/28/2017 build 235 and the builds from yesterday 7/27 Central. The bookmarks button and the hamburger button are not functional when using Xfwm4 only. However when I changed to Xfwm4+Compton both buttons work properly. Linux Mint 18.2 Xfce x64 addons enabled: uBlock Origin 1.13.9b3 Hide Caption Titlebar Plus 3.2.7 Tab Mix Plus 0.5.0.4pre.170625a1