@jasper @silmathoron indeed bug 179 explains the situation. To clarify & correct what I said, #Hydroxide does not officially depend on Firefox. If #Protonmail sends a #CAPTCHA then Hydroxide is dead in the water.. it just falls over with a error 9001. Developer "dvalter" created a hack whereby you can login using Firefox, harvest your session cookie, & pass the cookie to Hydroxide to use.