Opera Gestures is an innovative Firefox extension designed to enhance user navigation through customizable mouse gestures. This open-source tool allows users to perform various actions, such as navigating back and forth in browsing history, refreshing pages, and managing tabs with simple mouse movements. Users can easily customize the sensitivity of gestures and create a blacklist for specific websites where gestures should not be applied. The extension is lightweight and integrates seamlessly into the Firefox Quantum platform, catering to the needs of users looking for a more efficient browsing experience.

With Opera Gestures, users can execute a range of commands using intuitive gestures. For instance, moving the mouse left while right-clicking takes you to the previous page, while a downward gesture can open links in new tabs. The extension, however, comes with some limitations, as it does not function on certain pages like PDFs or specific web domains due to restrictions. Users should also be aware of minor issues, such as context menus appearing unexpectedly when gestures end on child frames.