Firefox has always had problems with memory allocation. Memory test can be run by typing about:memory in address bar and then "measure". On my system (ubuntu 12, firefox 25) I see a lot of "unused-gc-things" associated with Tw5 files which indicated fragmentation I believe.
cheers BJ -- You received this message because you are subscribed to the Google Groups "TiddlyWiki" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/tiddlywiki. For more options, visit https://groups.google.com/d/optout.

