Integration with other extensions - Obtain tab metadata

### Describe the feature you'd like to request

I would like to add support for two other extensions that I currently use [Multi-Account Containers](https://addons.mozilla.org/en-US/firefox/addon/multi-account-containers/) and [Tree Style Tabs](https://addons.mozilla.org/en-US/firefox/addon/tree-style-tab/).
To begin with, in order to support integrating with these, one would need to be able to store tab metadata. Namely:
- The container ID from Multi-Account Containers - this is typically a numeric index
- Tree Style Tab position or parent-child info - I'm not yet sure how this is stored but could be extracted as one UUID. Each tab would have a parent that could be another tab or blank. Blank would imply that the tab is displayed at the first-level or root.
- Window ID - Instead of restoring all tabs on a single Firefox Window, it would be convenient to restore them in different windows.

### Describe the solution you'd like

First I would like to know if it is possible at all to obtain and store this type of metadata.

### Describe alternatives you've considered

At the moment I'm reopening (in the right container) and sorting/reorganizing tabs manually after they are restored by floccus. It's quite inefficient and time consuming though.