You should only have one sessionstore.json and one bak at most. You can delete the others. Probably older files left over from migrating to sessionstore.json.

FRG

David E. Ross wrote:
On 10/14/2017 11:19 AM, Larry S. wrote:
Mason83 wrote:
On 13/10/2017 21:00, Larry S. wrote:
My profile contains 14 versions of the file "sessionstore", numbered 1
thru 14, plus two called sessionstore.json and sessionstore.bak.

Do I need all these? Any? Can I delete some? All? What are they?

https://addons.mozilla.org/en-US/firefox/addon/about-sessionstore/

Quoting that page:
Firefox writes the sessionstore.js file to disk every 15 seconds, to
be able to restore tabs after a crash or restart. Certain sites can
make the sessionstore.js file grow very large leading to poor
performance, this addon can help identify which tabs store unusually
large amounts of data (form data, DOM sessionStorage, or many
subframes/history states).


See also:
https://support.mozilla.org/en-US/questions/1057949

Regards.

Thank you, Mason, for your insights. Your reply helps me understand the
purpose of the file, but it doesn't fully address my concerns. I don't
seem to have a "Sessionstore.js" as your reference discussed (but do
have a json in many versions).

In addition to the json and bak (alone) versions, I have fourteen json
versions numbered 1 through 14, with dates stretching back almost six
years. It's those I still wonder about.
Larry S.


In each of three of my five profiles, I have one sessionstore.json and
one sessionstore.bak.  In my other two profiles, I have no sessionstore
files of any kind.  In those two profiles, I have set my [Privacy &
Security > Private Data] preferences to always clear my Browsing
History, Location Bar History, and Cache.

I suspect (but have not tested) that clearing my Location Bar History is
what deletes sessionstore.json and one sessionstore.bak.  From the prior
comments in this thread, I believe you can safely delete the numbered
sessionstore files and any sessionstore.js as they are likely obsolete.

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