Support for users' system color scheme (light and dark modes). Better handling of the Pinboard popup closing.

Now the keyboard shortcuts of the add-on can be properly set with Firefox's built-in manager for extension shortcuts.

Improved addition of bookmark descriptions. Now it's possible to select part of the content of the page before invoking the extension to set this selection as the bookmark description. Also, if there's no selection on the page the extension will try to use the page description meta-tag instead.

IMPORTANT: Fix a bug that could close the main browser window.

Fixed an issue regarding the popup automatically closing.

Fixed a bug that caused "Save to Pinboard" to save the bookmark as "Save to Read Later". Fixed a bug that was preventing the popup from being automatically closed after saving the bookmark.

Added buttons and shortcuts for marking a page as "to read". The buttons now open a popup instead of a window/tab. The popup is automatically closed after the pinning is done.

Changed default keyboard shortcut to Alt+P.
Small menu fixes.

SVG icons and a keyboard shortcut for adding pins.