My indispensable addons don't work in Thunderbird 60.x (Japanese popup readers rikaichan, rikaichamp, yomichan, etc.) nor in 52.x (lightning calendar) so I want to downgrade to an even older version when all was perfect. How can I do it? I read the thread about downgrading Thunderbird to the PREVIOUS version but I can't find how to downgrade even further. I don't know if older versions are still in the repositories and I should just find/guess the filename/version or if I have to install from another source. I had been patient to solve this in some eventual update but this unpleasant situation has not been resolved for too long and it was much more functional before. Please help!!
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