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CloseDeveloper reply by mikhail_s
Rated 2 out of 5 stars
The cache viewing add-on turned out just a Web Archive shortcut context menu generator.
This review is for a previous version of the add-on (1.9m1.1-signed.1-signed).1) All works as expected.
2) Not only Web Archive.
To create your own collections, you must have a Mozilla Add-ons account.