I just want to remind people that read my blog that Firefox 17 is the next Extended Support Release for Firefox. It's currently available in the beta channel. You should be testing with this. A lot. (I would hope you started testing when Firefox 17 was in the Aurora Channel).
The Firefox 10 ESR will be supported for 12 weeks after Firefox 17 to give you time to test and deploy, but if there are major issues you need to find them now.
PLEASE don't put off testing Firefox 17 until the ESR is released.
You also need to know about some Firefox changes that will affect you.
- Customized preferences file should go in defaults/preferences, NOT defaults/prefs. I've mentioned this before, but it's worth repeating.
- It is no longer possible to prevent the safe mode dialog via the method I posted here. There is no way to prevent a user from entering safe mode. A bug has been opened.
- Changing application.ini no longer works. I know people were using it to disable the crash reporter. They were also using this method to modify Firefox to coexist with another Firefox (different profile directory, appname, etc.). There are workarounds for this, but they involve passing a parameter when you start Firefox. Take a look at bug 723493 for more details.
- The ability for a user to switch to tabs on bottom has been removed completely, but it can still be done via a preference (browser.tabs.onTop).
I will be updating the CCK Wizard soon to make sure it works properly with Firefox 17.