There is a simple keyboard shortcut, if you have copied formatted text and want to paste it into the ಫೈರ್ಫಾಕ್ಸ್ browser as unformatted text.
To paste the text as unformatted plain text into ಫೈರ್ಫಾಕ್ಸ್ browser, press the following keys:
Ctrl + ಶಿಫ್ಟ್ + V
No extra plugins are required. This was tested in Firefox 52 on ವಿಂಡೋಸ್ 10. If this works in a different Firefox version or does not work in a specific Firefox version on various platforms let us and other users know in the comments section below.