Disable compose and dead key transient characters
I use AltGr as a compose key to insert accented characters. E.g., to insert "ë", I type
Now, in Firefox, pressing
AltGr inserts an underlined dot character, and pressing
¨ causes it to replace the underlined dot with an underlined diaeresis. Then I press
e and "ë" shows up as expected.
In every other application I know, no character is inserted until that 3-key sequence is complete, so though Firefox is trying to help by inserting those transient underlined characters, it actually confuses me because my brain is not expecting a character until after the sequence is complete. It just looks like I have fat-fingered every time.
Thus the question: Can I disable those transient symbols for compose sequences in Firefox?
I have found nothing whatsoever by searching, but I did find a "compose" setting in
about:config. Toggling it, however, had no effect.