I'm looking for a random password generator solution for Opera (on GX), but I just found an extension called "Random password generator", less known by the way, but to avoid installing new extensions on my Windows system, for safety, especially when the extension is little used/disclosed/known, as palliative using the random password generator embedded into Microsoft Edge, just enable the option in Edge settings (Profiles, Passwords, Suggest Strong Passwords) to allow generating a random password in any Password Creation field to generate a strong password, then I copy it and use in the Opera tab. I hope Opera Devs create a build-in random pass generator (like edge/chrome/firefox) to avoid installing unknown extensions.