Extender offers some neat features that would be really helpful, if they would just work without crashing Safari. Unfortunately, after using Extender for about two weeks, I have positively traced the cause of a series of recent Safari crashes to the the Extender plugin.

How many times have you closed a tab and then come back later and opened a new one? If you're running the Extender plugin, you can't do that (at least not on an Intel Mac).

You see, with Extender loaded, when you have two or more tabs open, if you close the right-most tab and then right-click on the tab bar, as you would, if you were preparing to open another tab, Safari crashes EVERY TIME. This only happens if you close the right-most tab. Closing a middle or the left-most tab does not cause this crash. Also, if you do one of several other actions within Safari, before attempting to open a new tab, it will not crash Safari. But, EVERY TIME you close the right-most tab and then right-click on the tab bar, without any intervening Safari actions, Safari will crash.

Removing the Extender plugin, resolved the problem. Reinstalling the Extender plugin, re-introduced the problem.

Although Extender offers some neat functionality that Safari is lacking, this tab problem is such a basic flaw that I cannot recommend it. Even if you don't use tabs, just the presence of such a basic flaw suggests that there are likely other problems, hiding just below the surface. Since I had to remove Extender, I can't tell you if there are any other problems with it.