This add-on creates a 'reload frame' button on the right click context menu. If you right click within a HTML frame and select 'Reload Dat Frame', the frame you clicked in will be reloaded. If you right clicked on an element that is not within a frame, nothing will happen.
I came up with this add-on out of necessity. I recently moved from Google Chrome to Firefox (OSS FTW) and the one thing that I lost in the transition is the ease of reloading a single frame. Hopefully with this add-on, my transition to a transparent and trustworthy web browser will be complete.