Old-timer door ShenLoong99

Note: This extension is for academic assignment purpose.
Able to change color scheme of the webpage to classic color scheme

Note: This extension is for academic assignment purpose.
The Old-timer extension will be able to perform these changes:
- User can change color scheme of the webpage with the range slider in the extension
- User can also change the degree of color scheme from 0 to 100 (ranging from normal color to classical/Old time color)
- Anyone can use it easily, the user-interface is very simple, minimal & friendly.
- No username or password is required.
- This extension can work on almost all webpages, except Mozilla setting and configuration pages