Firefox often let's you bypass this shit with holding shift + right click or select the text you want to paste and drag and drop it into the field.

https://www.kodemuse.dev/enable-copy-paste/

In about:config, set dom.event.clipboardevents.enabled to false.

https://github.com/jswanner/DontF-WithPaste

if you don't want to or can't use extensions, just right click > inspect on the password field, then right click the element highlighted in the HTML and click "use in console" or "store in global variable" depending on browser

it'll put something like

temp0 into the console

just change that line to

temp0.value = "yourpassword"
```  and press enter

it sounds verbose to explain but it's just a couple of clicks and one command, if you're using a password manager it's still a lot easier than typing out a random string and it should work with most text boxes and inputs, might not work if the page is doing something fancy.

On macOS:

Love that Keyboard Maestro has an “Insert Text By Typing” feature/macro where text streams from your cursor :)

If all the other things fail, you can still use an auto-typer.

https://webextension.org/listing/allow-right-click.html (downloads at the top)

You go to the offending page, click on the extension icon and it should remove the restrictions (if it doesnt work, you can try changing some of its settings)