What files can I exclude from Time Machine backups?

I'm running Firefox on OS X Mavericks. I use Time Machine to back this computer. I know that Time Machine will automatically avoid backing up my web cache. But which of the files in my profile directory can I not back up? I'm particularly interested in webappstore.sqlite, cookies.sqlite, and healthreport.sqlite since these are on the large end and seem to change frequently.
I already have excluded bookmarkbackups and places.sqlite. I have the browser set to automatically export my bookmarks so if I need to restore my machine I'll get back my bookmarks but not my browsing history, which seems reasonable.

What kind of data is valuable to you?
A reset for instance preserves personal data like bookmarks (places.sqlite, JSON backups), history (places.sqlite), cookies (cookies.sqlite), passwords (signons.sqlite and key3.db), form data (formhistory.sqlite), open tabs (sessionstore.js)
See these articles about information on files:
*http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox
*http://kb.mozillazine.org/Profile_folder_-_Firefox
*https://support.mozilla.org/kb/Recovering+important+data+from+an+old+profile

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