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With new version 0.1.3, after restarting Firefox after normal install restart, the Add-on Manager does not display, or rather the page is displayed but not the content, the cursor turns indefinitely ... I switched back to Scriptish 0.1 accordingly.

Это отзыв для предыдущей версии этого дополнения (0.1.3.1-signed.1-signed). 

This is a race condition that happens for FF < 6, so you can upgrade now, or wait for the next release (which has a fix in it), which I should make soon.