Q: On a scale of 1 to 10, with 1 being the easiest, how difficult was it to write to the WebExtensions APIs? In general, it was a 2 or 3. WebExtensions APIs are

Q: On a scale of 1 to 10, with 1 being the easiest, how difficult was it to write to the WebExtensions APIs? In general, it was a 2 or 3. WebExtensions APIs are simple enough and clear for extensions that just add a new button, sidebar, or other unique feature to Firefox. However, there are some undocumented behaviors on edge cases, and they might be closely tied to a specific Firefox release you’re working on. If you’re writing extensions that change Firefox’s behavior, you will need to dig into those undocumented behaviors. Sounds like the same pitfalls as writing a XUL extension...