Apparently, the recent long firefox context menu bug posted a few days ago, is not a niche bug after all. This looks like a consistent bug that happens to me on Windows XP. The Context menu is supposed to change with *context* invoked on. Looks like the logic around making it intelligent, is kind of buggy. I was able to reproduce the long menu bug on other websites, at random. However, one thing I was able to consistently reporduce is the inablilty to get context menu for text selection. See the difference in the menu.
Firefox 3.6
Firefox 4.0b6
Firefox 3.6
Firefox 4.0b6