UI Redesign; Part 3

1. Autohide sliding panels when closing the main panel.
2. Clicking everywhere outside an sliding panel while it's opened make
it close.
3. Changed some icons.
4. Improved toggle behavior for the injected panel. Now it also supports
the "Download Links" button located in the toolbar button panel.
5. Increased addon version to avoid wrong auto updates.
6. Resize tabs in some weird cases due to SDK issues (Adapted to the
newer interface version).
7. Other minor improvements.