In Firefox you can control the playback speed of HTML5 videos by pressing F12 and typing the following in the console:
document.getElementsByTagName("video").playbackRate = 1
Although this method is reasonably general (up to 4x with audio and up to 16x(?) without audio), it is somewhat cumbersome to do manually. It would be nice to have a shortcut and, moreover, a way to set a default value for all playbacks.
There are a couple of Firefox add-ons that seems to solve these issues (i.e. shortcut and default value):
However, according to Wikipedia, there are some security risks associated with add-ons.
- Is it possible to solve the aforementioned issues without add-ons?
- Are these add-ons safe?