Seemingly inconsistent behavior, when deleting individual tabs by using the close tab button on the tab; Don't recall it being like this in the past.
1) starting on the right end of several tabs working back one at a time deleting using the close tab button on the tab, one click works for all tabs
2) starting away from the right end of several tabs working forward one at a time deleting using the close tab button on the tab and deleting multiple individual tabs; one click suffices on the first deleted, but two clicks are required for each of the remainder

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I have the latest Tab Mix Plus development version extensions.tabmix.version;0.3.8.7pre.111011a
Windows Vista Ultimate SP2 X64
Firefox 8.0