Hi, I run TB 78.6.0 on Win 10 20H2. When I serach for add-ons I have a very weird situation. URL: https://addons.thunderbird.net/de/thunderbird/addon/removedupes/?src=search When I load this URL with a current firefox web browser it does show me the current version as "0.5.1b2" and will download that version. When I search for add-ons from within TB I get to this very same webpage URL that shows me version 0.3.11 last updated from year 2015. And if I push the "download now" button it will actually download this old version. I wonder what is going on here???? Can it be that TB internal browser has a stored cache somewhere and is using this? Are there any config settings in TB which change TB browser behaviour? Maybe some security settings changed?