Rated 5 out of 5 stars

by trashbasu on March 15, 2025 ·

Many thanks to "the-nic" for offering a solution to use this add-on on TB 136.

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To make the addon work on 136, one only has to update strict_max_version in the manifest version and change the first lines in experiment.js to

const { ExtensionCommon } = ChromeUtils.importESModule(
"resource://gre/modules/ExtensionCommon.sys.mjs");

then it works again :)
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Sorry for the spelling, but English is not my native language.

1. Change the plugin extension from .xpi to .zip
2. Unzip the .zip file
3. Edit manifest.json with Notepad
4. Change "strict_max_version": "128.*" to "strict_max_version": "136.*"
5. Save
6. Edit experiment.js with Notepad
7. Change
const { ExtensionCommon } = ChromeUtils.import(
"resource://gre/modules/ExtensionCommon.jsm");
to
const { ExtensionCommon } = ChromeUtils.importESModule(
"resource://gre/modules/ExtensionCommon.sys.mjs");
8. Save
9. Zip all files back into a new .zip file.
10. Change the .zip extension to .xpi
11.- Install the plugin in TB.

I hope it's useful for others. I don't know if there's a better way to accomplish this.

Regards and thanks again to the-nic.

by rsjtdrjgfuzkfg (Developer) on March 15, 2025 ·

The steps you explain are good and safe, as you only whitelist a version that you explicitly tested. That said, you will have to re-apply these steps for each monthly release.

Given that there seems to be a lot of interest from people that have a solid technical background, I did publish an unsupported build on https://github.com/rsjtdrjgfuzkfg/thunderbird-minimizeonclose/releases/tag/v2.0.1.4-1-g981004e which completely disables the compatibility check. That build *could* support future versions as well.

Warning: using incompatible add-ons may lead to issues down the line, which might include loss of data. Unsupported builds cannot protect you from that, they are only intended for people that understand the risks, have a solid battle-tested backup strategy and like to live on the edge ;)

For normal users, I recommend to stick with the officially supported ESR version.