Whenever I click the “Apply” button in the extension, whatever action is selected runs successfully, and then the extension window closes. I have to open it again in order to select another action. This gets a bit cumbersome. Any advice?
That is common (but annoying) behavior on Linux. When this is the case, take care that if there is a dialog box produced when the extension runs, it may appear that the software hangs or becomes nonresponsive until you move the main window and acknowledge the dialog.