Default Shortcuts shouldn't overwrite YouTube's -5s +5s

[ImprovedTube]

by default navigating frames should NOT be left & right arrow key, but same as youtube , & .

(The Extension is more relevant and just shooting itself in the foot a bit with this)

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(and instead of framerate, there should be shift+up or down - for a smaller interval, like 1s/60, where possible)

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_ (One should usually let any current default stay for the existing users (~5000) - (can't guess how many people don't mind, because they never used left&right for the 5second-navigation.