A new update for Clippings is now available from 
Mozilla Add-ons and the 
AE Creations website.
If you already have Clippings installed, it will be upgraded for you if automatic extension updates are enabled. Otherwise, open Add-ons Manager (Tools -> Add-ons), then right-click on the entry for Clippings in the list of installed extensions and choose Find Updates.
What's New in Clippings 6.2:- Clippings now supports Dark Mode system themes on macOS and Windows
- You can now choose how you want the date or time to be formatted for
 the $[DATE] and $[TIME] placeholders; for example, the date with the 
day of the week included, or the time given in the 24-hour clock
- A new option for Sync Clippings users to only show synced 
clippings and folders on the Clippings menu
- Brought back the ability to redo an action in Clippings Manager
- New option to add the date to the backup file name
- Many other fixes and improvements
For more information on the new features in Clippings 6.2 and how to get it, 
read the blog post on the AE Creations blog.  Send your questions and comments to the forum.