This started 2 months ago. I used to be able to open the full interface on octoprint with firefox. Now, when I click on the control tab it locks it up and if I change tabs on firefox and come back to octoprint it just shows me the loading wheel for firefox. I am unsure of what has changed.
Starting an inprivate session seems to fix the problem. Removing all extensions/plugins does not. I have no problems in Chrome or in Konqueror. I have uninstalled firefox and reinstalled it with the no change. Ocotprint loads fine on the other 2 gui browsers I have loaded on this machine, so I know that it has to be a mozilla problem.
No need to run in safe mode as it works properly on other browsers.
Update: Same issue exists in safe mode
Not required to test in safe mode
You can download this in OctoPrint's System Information dialog ... no bundle, no support!)
browser.user_agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/534.34 (KHTML, like Gecko) konqueror/20.12.3 Safari/534.34
env.plugins.pi_support.model: Raspberry Pi 3 Model B Plus Rev 1.3
OctoPrint version, OctoPi version, printer, firmware, browser, operating system, ... as much data as possible
browser is firefox 94.0 (64-bit)
OS Pop!_OS 21.04