Really. You might not be happy, but your comment does your point no benefit. Thunderbird is not a Mozilla product, nor has it technically been since 2012. It does not even have the Mozilla name or brands on it. The only thing that is Mozilla is they let us use their support forums and provide a legal home for the project. (A US charity) Have doubts about what I am saying, go to their web site and have a look at their projects. https://www.mozilla.org/ Thunderbird is not one of them. Perhaps making [https://donate.mozilla.org/en-US/thunderbird/?utm_source=thunderbird.net&utm_medium=referral&utm_content=footer financial donations] to Thunderbird so the development team can grow would be a more appropriate response to a perceived lack of features. Some history can be read in the announcement from the chair of the Mozilla foundation in July 2012. https://blog.lizardwrangler.com/2012/07/06/thunderbird-stability-and-community-innovation/ Thunderbird is built on the core of Firefox, something that used to be called Geko. So while not associated with Mozilla in a build sense there are dependencies on the core of Firefox that simply can not be removed, at least not without a complete rewrite and a change of development platforms. So change based on Mozilla changes are somewhat inevitable although the Thunderbird team has resisted the changes to the add-ons, the position became untenable in the last 12 months. The developers of Thunderbird are a very small group and can not take on more additional responsibilities. They are struggling to cope with the rate of change that has come from Mozilla's project quantum as it is. So you might not be happy, but neither are those imposing the changes on you particularly well pleased. They are coping with the changes as best they can and trying to move the code base into a position where it is not as dependent on the Mozilla core. This is a slow and expensive process. Both in terms of money and expertise. Just keep in mind that most of the add-ons that have not been updated were abandoned by their authors years ago, often because no one donated to their attempts. Those that have been updated will not show as the new version has to be restarted for many of them to complete their updates. There have also been a number of changes in the authors of some add-ons, with authors announcing they will not participate in further change so someone else either re launches the add-on. So there is a new one (import export tools for instance), or hand over development to the new comer (Exquilla). Knee jerk reactions are not helpful. While we all like to live in the past. It was safe and warn in our memories. The reality is new threats and exploits appear every day and programs like Thunderbird require active development to remain secure. You "internet security suite" is only as good as the updated versions of your software.