Bugzilla

Here's an extension of your patch, with suitable MailExtension APIs. I have a rewrite of Manually Sort Folders that uses these APIs for sorting the accounts, so things seem to be working fine.

Some remarks:
- I could not force a rebuild of the folder pane, so now Thunderbird needs to be restarted for changes to be taken into account; previously, it was enough to do:

```
          // Force a rebuild of the account tree.
          let mainWindow = Services.wm.getMostRecentWindow("mail:3pane");
          mainWindow.gFolderTreeView.mode = mainWindow.gFolderTreeView.mode;
```

but this no longer seems to work. Any advice?

- There were some issues with the schema description, for which I filed bug 1606570, but it's non-blocking
- I designed the MailExtension API to be nicer than just a raw wrapper around the prefs. Let me know what you think.

Thanks,

Jonathan

Here's an extension of your patch, with suitable MailExtension APIs. I have a rewrite of Manually Sort Folders that uses these APIs for sorting the accounts, so things seem to be working fine.

Some remarks:
- I could not force a rebuild of the folder pane, so now Thunderbird needs to be restarted for changes to be taken into account; previously, it was enough to do:

```
          // Force a rebuild of the account tree.
          let mainWindow = Services.wm.getMostRecentWindow("mail:3pane");
          mainWindow.gFolderTreeView.mode = mainWindow.gFolderTreeView.mode;
```

but this no longer seems to work. Any advice?

- There were some issues with the schema description, for which I filed bug 1606570, but it's non-blocking
- I designed the MailExtension API to be nicer than just a raw wrapper around the prefs. Let me know what you think.
- I had to set all of the API functions to be async but I don't understand why; is this a requirement of all WebExtensions?

Thanks,

Jonathan