Filters wót chemtrails

Adjust brightness, contrast, saturation, warmth for a better reading experience.

Usage:

1. Right-click anywhere on the page
2. Click "Filters"
3. Adjust the levels
4. Close with top-left button

When you set the levels, they are saved for the current website.
Click the top-middle button to reset levels for the current website.
Click the top-right button to apply levels to all websites.
Website levels take precedence over global levels.