Hi, thanks for leaving feedback!

I'm sorry to have cleared your collections, I know this is painful. As you may have read elsewhere, Firefox will automatically update extensions regardless of version number. But, in case you were not aware of this, there is actually an export feature in the settings menu (the cog wheel above the request) :)

If you wish to recover your old collections, it may be possible to go into the old versions of RESTED (https://addons.mozilla.org/en-US/firefox/addon/rested/versions) and download version 0.9.1 and see if your collections are still there. If they are, you can export your collections and import them to the new version. If you try this, please leave a comment with your experience.

Also, I can assure you that this should never happen again. I batched all the breaking changes together, making sure that the extension now is worthy of 1.0, i.e. a stable version.