If you use Apple Safari to browse the net and find that add-ons you have installed, begin to not work, it may not be that the add-on that is failing.
Apple in their wisdom(?) have decided to start charging add-on developers $99USD to have their add-ons 'certified'. If a developer doesn't pay, the add-on will no longer work in Safari. So if you use Safari and find things like your add-on EXIF viewer no longer works when you are on Ausphotography (and other sites), then it may not be the add-on that is the cause.