Safari extension won't install

It appears to be a bug affecting some users on El Capitan.

There are two reported solutions:

  1. Reboot into safe mode to install extensions (not ideal)
  2. Use the keyboard to select 'Trust' rather than the mouse.

I think option 2 would be the way to go. Here's how to do that:

Go to System Preferences > Keyboard > Shortcuts. In the bottom section there is the text "Full Keyboard Access: In windows and dialogs, press Tab to move keyboard focus between:". Under that, select "All controls". Now the user can use Tab when the prompt to install the extension pops up. To submit the form use Spacebar (enter doesn't work).

Hopefully this gets fixed by Apple at some point.

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It would be nice if the site mentioned that (even though I'm mainly interested in Throttle for my iPhone...) in order to get the browser extension (I'm guessing you mean for both Safari on my Mac AND on my iPhone), my Mac MUST be running El Capitan also - ?!?

So even though my iPhone is updated to iOS 9.3.3, I'm dead in the water until I have all my Macs updated (and I have some files on my MBPro running 10.6.8 which I am still getting transferred to newer apps for opening). :-P