Are there any that you particularly dislike? Feel free to file an issue here: https://github.com/cmcaine/tridactyl/issues. All of the permissions we ask for are because we need them for features, as we try to explain in the add-on description.

It would be nice if we could just ask for permission when the features are first used, but unfortunately most of the permissions we need are not supported by permission requests at runtime - https://developer.mozilla.org/en-US/Add-ons/WebExtensions/Request_the_right_permissions#Request_permissions_at_runtime.