Let's try this.

Start Firefox using Troubleshoot(Safe) Mode {web link}

A small dialog should appear. Click Start In Troubleshoot(Safe) Mode (not Refresh). Is the problem still there?

If you can enter the Primary Password, change it to no password. Then restart.

Thanks for a speedy reply, the problem still exists after restarting in safe mode.

I am still unable to type anything in the password box.

Start your Computer in safe mode with network support. Then start Firefox. Try Secure websites. Is the problem still there?

Starting Any Computer In Safe Mode (web link) Free Online Encyclopedia

https://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/

https://www.digitalcitizen.life/4-ways-boot-safe-mode-windows-10/ +++++++++++++++++++++++++++++++++++++++++++++++ If the problem goes away with the computer in Safe Mode, the problem is with one of the other programs on the system.

As a test, disable your protection programs.

Restarting in safe mode gave me a clue when I tried to enter my password!

When I started typing the first character was obscured by a dot as usual, upon typing the second character the dot disappeared, however, I typed the whole password and it was accepted even though there was not indication anything had been typed.

On restarting normally I repeated this and entered the master password. The dots did not appear but the input was accepted and I was able to access my logins and passwords.

It would seem that my only problem is that I can not SEE that I have typed characters into the master password box.

I would class this as resolved as I can do what I need to do and the problem is nothing more than cosmetic!

Thanks for helping me.

Sounds like a problem with the font in that the color of the typed characters is the same color as the background.

See if this helps; [v56+] Type about:preferences#general<enter> in the address bar. Under fonts and colors, press the Advanced button. Scroll to the bottom, turn on Allow Web Sites To Choose Their Own.

Make sure you haven't enabled a High Contrast theme in the OS settings.

• We have seen reports that this can be caused by a problem with fonts like Roboto or Helvetica that

you have installed locally and that might be corrupted or are missing some variants. Also, make sure you allow pages to choose their own fonts and that you do not block remote (downloadable) fonts.

• https://support.mozilla.org/questions/1325619 Weird font on some website's

• If you use uBlock Origin make sure not to "block remote fonts".

You appear to be using unstable 94 Nightly, so you can expect issues happening from time to time.

You can create a new profile as a quick test to see if your current profile is causing the problem.

See "Creating a profile":

• https://support.mozilla.org/en-US/kb/profile-manager-create-remove-switch-firefox-profiles

If the new profile works then you can transfer files from a previously used profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over problems.

• https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile

Thank you again for your replies and help, I did not have time to look at this yesterday.

Last night Nightly updated to version 94.0a1 (2021-10-02) (64-bit) and now the master password box appears as it used to before my problem began.

I intended to work through some of the offered solutions and I suspected that uBlock Origin could have been a potential issue but as the problem no longer exists there seems little point in changing things.

I am grateful for you taking the time to help.

That's good to hear. Please flag your last post as Solved Problem as this can help others with similar problems. Go to that post and click the 'Solved' button to its right.