It is the petition for the Holy Father to celebrate a Tridentine Latin Mass.
It may not be as forlorn a hope as you might think, The Eponymous Flower has an optimistic post on the possibility (if you can overlook the use of the word "upcoming") and the petition has round about 700 signatories as we speak.
Apparently, you need at least 12,000 before Rome will think about it.
That is achievable...but only if you blah blah...sign.
You may do it here: PETITION
Please do it before you leave this page. That's a plea, not an order.