Add a setting for enabling/disabling swipe navigation

[Ford_Prefect]

For such an annoying feature as "swipe navigation" there should at least be a setting option without having to go through "about:config" first.

browser.gesture.swipe.left
browser.gesture.swipe.right

Furthermore, I find it strange that after some updates my settings are simply overwritten and this feature is activated yet again.

[Jon]

Thanks for submitting an idea to the Mozilla Connect community! Your idea is now open to votes (aka kudos) and comments.