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מאת impact0r בתאריך נוב' 20, 2019 · קישור קבוע

You can still use that extension if you run Thunderbird 60.
If you are on Linux, and regular install wont' work due to broken libraries, you can install it through snap:
"sudo snap install thunderbird --beta"
If you are not on Linux, think about what you're doing with your life.