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@feodor2 I found the problem! After overwriting with the newest version there was a forgotten config.js file in the folder. In there was a patch for unsigned addons. This patch interferred with newer versions because there was probably a change in the source code from 3b to 4b. I'm very sorry for all the trouble! P.S. I found a small annoyance in the title-bar of the XP-skin after changing to fullscreen-mode: Normal: Fullscreen: Sorry for the pictures but I think they're needed here.

@Feodor2 As seen in picture 2, with "save link as" the xpi also isn't installing via drag&drop. As seen in picture 3, after import from an old 3b profile it shows "(disabled)" in the title and i can not activate it, only "Remove".

@Feodor2 5b, fresh profile, nothing changed, no addons: And after import from an older 3b profile:

Hello to all MyPal users, I want to upgrade my MyPal 68.13.3b version to a newer one, but it seems some addons aren't working in newer versions. Some Addons which worked in 68.13.3b but not in the newer 4b and 5b: https://addons.mozilla.org/en-US/firefox/addon/cookie-quick-manager/ https://addons.mozilla.org/en-US/firefox/addon/tab-manager-plus-for-firefox/ https://addons.mozilla.org/en-US/firefox/addon/download-statusbar-webext/ https://addons.mozilla.org/en-US/firefox/addon/rss-html/ https://addons.mozilla.org/en-US/firefox/addon/indicatetls/ https://addons.mozilla.org/en-US/firefox/addon/http-indicator/ https://addons.mozilla.org/en-US/firefox/addon/sixindicator/ Is this a known problem? Thanks in advance for any help!