As a result of "Close Tabs to the Left" becoming standard functionality in Firefox version 88, this extension is now restricted to Firefox versions 87 and below.

Enhancements:
Added i18n support and basic translations for es locales.

Fixes:
Pinned tabs are now ignored when closing tabs to the left.

See: https://github.com/ParkerM/close-tabs-to-left/releases/tag/v0.0.3

Enhancements:

The menu item is now greyed-out when there are no tabs to the left.
Removed tacky icon from menu item.

Other stuff:

Migrated to typescript/webpack.
Migrated test suites to jest with mockzilla for browser mocks.

See: https://github.com/ParkerM/close-tabs-to-left/releases/tag/v0.0.2