firefox forces all key entries to uppercase (as if shift key is pressed)
regardless of sticky keys, shift lock or any other hardware. Other applications do not experience this issue and it is intermittent on Firefox. there is a "show password" add on and other extensions such as Flash and Java.
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It is possible that some of the status keys have the wrong state and Firefox sees them as still pressed.
Try to press all the status keys (Shift, Ctrl, Alt) a few times to see if that helps to recover from this. If it doesn't help then close and restart Firefox or reboot the computer.
Start Firefox in Safe Mode to check if one of the extensions (Firefox menu button/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.
- Switch to the DEFAULT theme: Firefox menu button/Tools > Add-ons > Appearance
- Do NOT click the Reset button on the Safe Mode start window