|User since||April 12, 2013|
|Number of add-ons developed||0 add-ons|
|Average rating of developer's add-ons||Not yet rated|
Tabs disappeared in Firefox 20 Rated 4 out of 5 stars
I was having the exact same problem as others, where my groups disappeared in Firefox 20. I was only saved by using Session Manager.
Update: Fixed by installing https://docs.google.com/file/d/0B_cPIh38WTUSc0hiM3VCUVRlVk0/edit?usp=sharing.Though my pages are out of order now.