Along with the release of Mountain Lion is an update to Safari 6 for Lion. I have been having so much trouble with Safari 5.1.x I have been warning Snow Leopard users to stick with 5.0.5.
Well, that's still true for SnL users, but Lion required 5.1. Even after 7 updates it was still a mess, displaying this horrible dialog often:
So the first thing I did to my Lion installation (before going to Mountain Lion) was to install Safari 6. The news is great: All the things I did to make that problem occur have not resulted in a repeat. There was one new problem, however: HTML5 videos on websites like FailBlog and YouTube were off center. I traced that problem to Click2Flash, a plugin that blocks all those horrible Flash ads that infest so many web pages.
After a little Googling, I discovered that it was the now-obsolete 2.5.2 version of Click2Flash that was causing the display error. I also read that the official website for Click2Flash is obsolete; you now get updates from Apple's Plugins page under the Safari menu. The current version is 2.6.2.
To install the update, you must first open Safari's Preferences, go to Extensions, choose Click2Flash, and click Uninstall. Then you can go to the Safari Extensions item under the Safari menu (above Preferences) and locate Click2Flash and choose Install. That gives you the updated version and the mis-aligned video window is fixed.
Also great news: The new version of Safari is MUCH snappier. One of the things I do with it is load 26 tabs at the same time (my Daily Comics collection) and I would usually have to wait and endure a lot of spinning rainbows before I could start reading and closing tabs. That problem is gone. If I have to reload a tab the Not Responding problem does not occur.
Granted all this is after only an hour's use, but I have to say at this point that I am very pleased with Safari 6.
Expect a flurry of updates from me over the next few days as I test out all the updates and spend time with Mountain Lion.