Review for Extension List Dumper by LeeToo
Rated 4 out of 5 stars
Stop working in firefox 30 after update from 29!
Used this for a long time, was good add-on, as it worked - maybe developer update it.
Alternatively you can use internal function about:support - this list also extension.
With button you can than copy text over clipboard to a text-editor.
To create your own collections, you must have a Mozilla Add-ons account.