Why was ability to pin webpage to task bar removed

I am running Windows 7 home premium with Firefox Beta 20.0, a couple of months ago I pinned a website to my task bar. Last week I accidentally unpinned it. I tried repining it by drag and drop to no avail. I can do it under IE10. I figure if I could do it before and now I can't It was must have been removed . Why? sysinfo:

OS Version: Microsoft Windows 7 Home Premium, Service Pack 1, 64 bit Processor: AMD E-450 APU with Radeon(tm) HD Graphics, AMD64 Family 20 Model 2 Stepping 0 Processor Count: 2 RAM: 3686 Mb Graphics Card: AMD Radeon HD 6320 Graphics, 384 Mb Hard Drives: C: Total - 465640 MB, Free - 185192 MB; D: Total - 11196 MB, Free - 1375 MB; L: Total - 152580 MB, Free - 107062 MB; Motherboard: PEGATRON CORPORATION, 2AD1 Antivirus: avast! Antivirus, Updated and Enabled

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