diff --git a/.abf.yml b/.abf.yml
index a2c8567..c6dfdc6 100644
--- a/.abf.yml
+++ b/.abf.yml
@@ -1,12 +1,2 @@
 sources:
-  firefox-17.0.1.source.tar.bz2: 15c09796a388f0a78996427b7bc2c80f4e0496f3
-  firefox-18.0.2.source.tar.bz2: fe5810d61edf6f4dc8bc477a08f9483b955f747b
-  firefox-19.0.source.tar.bz2: 816d64e8c9432349cd208fd181d210c54f985351
-  firefox-19.0.2.source.tar.bz2: d108d356225379a86d69a4906c706289135f6342
-  firefox-20.0.source.tar.bz2: 6d776c29da0be0d2a50abeb504d63b06b7861218
-  firefox-21.0.source.tar.bz2: e63b5488eaec1956947f59609d5839332ba7ffe1
-  firefox-22.0.source.tar.bz2: db2d5b028b6ea95b5f006b46e153f50f7a52bf80
-  firefox-23.0.source.tar.bz2: 31936d2ddb727640c96a3ae697bf145c42a2a20e
-  firefox-23.0.1.source.tar.bz2: 937bcd41aa316afff60b04fa4813f59bb9608631
-  firefox-24.0.source.tar.bz2: 6f333e6fc0d5740f7660e96e83642af901c89846
   firefox-25.0.source.tar.bz2: 854722e283659d2b6b2eacd38f757b3c5b63a448