Why does the "TAB" key no longer work to move the cursor from field to field with Firefox 17 in MAC OS 10.8?
The "TAB" key will not move the cursor from field to field with Firefox 17 in MAC OS 10.8. You have to use the mouse to click on the new field to move the cursor.
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Note: In OS X (as of 2005-01), if this preference is not explicitly set, the “Full Keyboard Access” setting in System Preferences will be honored. All builds before that date (e.g., Firefox 1.0.x) will ignore that setting.
This pref doesn't exist by default, so if you want to use it instead of the system settings then you need to create a new Integer pref with the name accessibility.tabfocus and set the value to what you want (7 is to tab through all the fields).