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), click on the entry for Clippings in the list of installed extensions, and then scroll down to the bottom of the page and click Check for Updates.
What's New:- Improvements to Dark Mode appearance of Clippings Manager (issue #296)
- Bug fix: Text in focused drop-down menus is hard to see in Dark Mode (issue #296)
- Bug fix: Unsupported file formats are not rejected when selected for import or restore from backup (issue #295)
- Other bug fixes and improvements
More information on this release, as well as instructions on how to get it, can be found in 
this blog post on the AE Creations blog.  As always, send your questions and comments to the forum.