I too have been seeing this issue on my Ubuntu 16.04.6 LTS installation and after living with it for a long long time, decided to hunt down reports of others with the issue. As I now see, it is a known issue. That sort of made me feel better - specifically that misery loves company - :(.
Here is how I can reliably reproduce this issue on my system: Configure at least 2 workspaces: On the left workspace, open an application - say Chrome On the right workspace I have Firefox If I switch between workspaces using keyboard shortcuts, the right-click context menu on Firefox continues to function as expected. Also, if I click the Workspace Switcher in launcher and select the different workspaces, again Firefox context menu functions as expected. However, if I click the Chrome icon in the launcher and then click the Firefox icon (in essence I'm switching workspaces indirectly), the Firefox context menu appears at random locations - mainly along the edges of the screen - I am yet to see it appear in a random location away from screen edges (see attached screenshot). I have noticed there are several ways to restore the placement of the context menu: * Middle-click the title bar (or the panel if Firefox is maximized) * Switch to another application running in the same workspace and return to Firefox * Move the Firefox window * Resize the Firefox window There could be other ways to restore the context menu, but the few I mention above work reliably in my environment. I'm hoping that when I migrate to Ubuntu 20.04 next year the issue will have been resolved. ** Attachment added: "Screenshot of Firefox context menu placement" https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1603430/+attachment/5305830/+files/firefox-context-menu.png -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1603430 Title: Firefox dropdowns in wrong location To manage notifications about this bug go to: https://bugs.launchpad.net/linuxmint/+bug/1603430/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
