- Fixed using runAs() with function literals. This was broken in Firefox 74 and up due to the removal of Function.prototype.toSource() in web content.

- Fixed issues related to changes in Firefox's stylesheets. The checkboxes and radio buttons should be visible again.

- Moved the configuration into its own page, to make better use of screen real estate. This counteracts a recent change in Firefox that shrunk the available width of the addon preferences page.

- Added import and export features. Individual contextlets can be exported to JSON files, which can later be imported again. An import file may contain a single contextlet or an array of contextlets.

- The Contextlets extension now requires the "menus" permission. This is needed in order to access the target element of the context menu, via OnClickData.targetElementId and menus.getTargetElement().

- Added some example contextlets.

- Fixed issue where items weren't being matched correctly after reordering.

- Added the ability to create more than one top-level context menu item, using the "Extra Contextlet" helper extensions.

1. Added an option to display line numbers in the code editor. Unfortunately, this currently prevents word wrapping when line numbers are enabled. Solving this will require a more substantial replacement for the editor (which I won't do without a solid native fallback).
2. Corrected URL pattern matching for the Frame, Editable Field, and Password Field contexts.
3. Added documentation for URL patterns in the API Reference page.