Trash folder within Extensions folder

Firefox now has a trash folder within the extensions folder in the profile.

What is the purpose of this folder, and why do some extensions wind up in the trash folder?

I don’t see a trash folder. What FF version are you on?

Version 39.0 (release). Never saw a trash folder before 39.0.

I’m thinking perhaps Firefox creates it when an extension installation fails or something like that. It would be great to have a better understanding.

I’ve looked at 39, 40, and 41, and don’t see a trash folder. Maybe @jorgev has a better idea.

I’ve never seen such a folder. Maybe it’s a temporary place for extensions that have been removed using the Add-ons Manager, but it could be something else (another add-on?).