nsMsgViewType
the nsmsgviewtype interface contains constants used for views in thunderbird.
...for example, to request the 'show all threads' view use the constant: components.interfaces.nsmsgviewtype.eshowallthreads constants name value description eshowallthreads 0 eshowthreadswithunread 2 eshowwatchedthreadswithunread 3 eshowquicksearchresults 4 eshowvirtualfolderresults 5 eshowsearch 6 ...

nsIMsgDBView
xpand); void expandandselectthreadbyindex(in nsmsgviewindex aindex, in boolean aaugment); void addcolumnhandler(in astring acolumn, in nsimsgcustomcolumnhandler ahandler); void removecolumnhandler(in astring acolumn); nsimsgcustomcolumnhandler getcolumnhandler(in astring acolumn); attributes attribute type description viewtype nsmsgviewtypevalue readonly: type of view.
... constants are defined in nsmsgviewtype.

Index
for example to sort by date you would pass a function the value: 1267 nsmsgviewtype interfaces, xpcom, xpcom api reference, thunderbird the nsmsgviewtype interface contains constants used for views in thunderbird.

nsIDBFolderInfo
xname astring nummessages long numunreadmessages long sortorder nsmsgviewsortordervalue sorttype nsmsgviewsorttypevalue version unsigned long viewflags nsmsgviewflagstypevalue viewtype nsmsgviewtypevalue methods andflags() long andflags( in long flags ); parameters flags missing description return value missing description exceptions thrown missing exception missing description changeexpungedbytes() void changeexpungedbytes( in long delta ); parameters delta missing description exceptions thrown missing exception ...

XPCOM reference
for example to sort by date you would pass a function the value:nsmsgviewtypethe nsmsgviewtype interface contains constants used for views in thunderbird.