5 ਤਾਰਿਆਂ ਵਿੱਚ 4 ਮਿਲੇ

Toggle Quotes adds a toolbar button and a shortcut key to QuoteCollapse.
https://addons.mozilla.org/en-US/thunderbird/addon/toggle-quotes/

ਇਹ ਸਮੀਖਿਆ ਐਡ-ਆਨ (0.9) ਦੇ ਪਿਛਲੇ ਵਰਜਨ ਲਈ ਹੈ। 

This does not appear to be a review of QuoteCollapse.
I don't mind linking to that add-on-add-on from the description or even integrating functionality.