Yomichan / Ankiconnect not pasting clipboard images into cards anymore on Firefox

[diosmio22]

(I'm reposting this here from the Yomichan issues since I'm not sure which is the right place)
Everything was working perfectly until some days ago: clipboard images were pasted in the clipboard-image anki deck field like normal, but now it just stopped working. I've tried resetting firefox but no luck. I can confirm the screenshots actually get saved into the clipboard, as I've also tested this with chrome and it works like a charm. But not on Firefox. Everything else still works like normal.