swipeGesture by void

When you reach the left or right edge of a page and swipe further from the screen edge, this feature is triggered.
Swiping right from the left edge takes you to the previous page, while swiping left from the right edge moves you to the next page.

This replicates Chrome’s behaviour but has some limitations due to being implemented with JavaScript.

Cases where it does not work:
- Protected sites like support.mozilla.org and addons.mozilla.org
- While the page is still loading
- When switching to a different tab

** Version 1.5.0 **
Feature Additions:
- Options menu
- User customisation for icon size, position, and swipe start/end points
Bug Fixes:
Fixed issue where the icon would become hidden