I can reproduce this as told in bug 1011163. Right click still works in "View source" window but immediately after closing the said window, right click stops working in FX.
Then I installed the debug version of FX from your PPA. The bug wasn't reproducible (by "View source" method) in the first tab I opened but after opening a second tab and trying again, the bug occured. Here's the output:
I can reproduce this as told in bug 1011163. Right click still works in "View source" window but immediately after closing the said window, right click stops working in FX.
Then I installed the debug version of FX from your PPA. The bug wasn't reproducible (by "View source" method) in the first tab I opened but after opening a second tab and trying again, the bug occured. Here's the output:
-1194391744[ 7f4db7914480] : GrabPointer: pointer grab failed: 2 (time=0x4fd76533 retry=1) 7f4db7914480] : GrabPointer: pointer grab failed: 2 (time=0x4fd76533 retry=1) 7f4db7914480] : GrabPointer: pointer grab failed: 2 (time=0x4fd76533 retry=1) 7f4db7914480] : GrabPointer: pointer grab failed: 2 (time=0x4fd76533 retry=1) 7f4db7914480] : GrabPointer: pointer grab failed: 2 (time=0x4fd76533 retry=1) 7f4db7914480] : GrabPointer: pointer grab failed: 2 (time=0x4fd76533 retry=1) 7f4db7914480] : GrabPointer: pointer grab failed: 2 (time=0x4fd76533 retry=1) 7f4db7914480] : GrabPointer: pointer grab failed: 2 (time=0x4fd76533 retry=1)
-1194391744[
-1194391744[
-1194391744[
-1194391744[
-1194391744[
-1194391744[
-1194391744[
Setup:
up-to-date 64-bit Precise
Unity 2D
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:13.0) Gecko/20120611 Firefox/13.0
5 tabs
2GB of RAM
Default Ubuntu FX extensions and Finnish localization