Ah, the old-fashioned Netscape Bookmarks.html file.  No, there's not, Mirskyman.  We've logged a half dozen requests for that feature, but it's not risen to the top of the to-do list yet.

Safari still has that capability.  So you can export to Safari, then in Safari click in the menu: File > Export Bookmarks….  Of course, if the bookmarks you're exporting to Safari are not your "regular" Safari bookmarks, exporting will overwrite them, so you'd want to import your "regular" Safari bookmarks to another Bookmarkshelf document and set that off to the side before exporting, then restore them with a second export after you've got your .html file.

I thought Firefox had this capability, but it looks like Mozilla has removed it now.  You can only export .json files from Firefox now, no more .html.

Oh, I see that iCab can still do it too.  So you can export from BookMacster to iCab, then iCab to .html.  In iCab, it's menu > Bookmarks > Export….