After trying in Firefox (84.0.1 (64-bit)) and not working with a website (the little pop-up window after clicking from the webpage's context menu was just hanging) didn't want to believe it is broken.... (checked the similar add-on in Edge_chromium with the same web page - my backup browser with no privacy and security addons installed - it worked there as expected.) After a while I have realised that the webpage I wanted to create a task from was not permitted in NoScript (TickTick was of course). After permitting it in NoScript, I could add the task without a problem).