You could search for sessionstore* in explorer to see if there are any, assuming you have this function enabled. I don’t and the sessionstore isn’t part of the default installation. I have 0 sessionstore-*.js files on my system.
Now you have found them ;D I would imagine you have them limited in some way.
The number of sessionstore files in FF is partially dependent on the number of days you have asked to store browsing ‘history’.
Since I use the FF option to ‘clear private data’ (Tools > Privacy > Private Data) each time I close FF (including browsing history), I seldom have more than 2 sessionstore files: 1) the base sessionstore.js; and 2) sessionstore-n.js).
PS: Since I do not keep browsing history, the sessionstore files disappear when I close FF…
Good answer. Thanks.
Not a good answer … sessionstore retention has nothing to do with browsing history.
The sessionstore file disappears for most users on every termination of Firefox … as I explained above.
Yup, there should not be multiple sessionstore files, its function is to restore the last session only.
Strange even when I have just opened firefox and right now I don’t have any sessionstore*.js files. I do have the ‘Show my windows and Tabs from last time’ option set. So any tabs I leave open when I close firefox are opened on start, yet I have zero sessionstore files ???
Except if the browser crash or the computer is shutdown (power failure). Seems the file is kept there. Am I wrong?
You are right.
As I said - the file is deleted on normal termination (for most users) and in the case of an abnormal termination it is still there and used to offer the user the chance to restore the previous session.
However I am curious about David’s report.
There was another topic about multiple sessionstore files and I checked at that point and I didn’t have any. I though this was something that you had to physically select as an option or install an extension, etc. and since I hadn’t done that, I though that was why I didn’t have any sessionstore files.
From Alan’s post, etc. I find that this should be a default action, one that isn’t working on my system. I don’t know if this might have anything to do with the fact that I run firefox under dropmyrights, though I would be surprised if that were the case as I can even install extensions under DropMyRights.
Update:
OK I shutdown firefox and checked for and found sessionstore.js, however, when I restarted firefox the sessionstore.js file is gone. So that might account for why I couldn’t find it whilst firefox was running. So it would appear that the sessionstore.js file is written on closure, which seems strange to me as in the instance of a crash or abnormal shutdown how would this file be written.
Nor do I understand why there would be sessionstore-n.js files if only one is supposed to be stored, I would have thought it would overwrite the sessionstore.js file ???
If you use DropMyRights after installing and using Firefox, will DropMyRights reuse the settings (bookmarks, extensions, etc.) or it will start a new profile?
It’s not ‘up to be written’ when a crash occur, but it seems to be a temporary file continuously updated, so it’s there, ready, before the crash.
Well, there you have it. Note the name “cluelessuser” is appropriate! ;D My observations on my system are not generalizable…
On my system, while FF is open, there is always at least sessionstore.js and sessionstore1.js. I always assumed that the sessionstore.js holds general parameters of the session while sessionstore1.js tracks tabbing and browsing history to update sessionstore.js.
There have been times when I’ve had up to sessionstore3.js. Perhaps if sessionstore1.js is (for whatever reason) still in existence, it will create sessionstore2.js, etc.
My system is old and slow, so it will sometimes take up to a minute for sessionstore.js to ‘go away’ after closing FF (also, I have other system complexities that may contribute to that timing).
BTW, I see this exchange going on continuously while running Avast Standard shield, as it is scanning both sessionstore files while I ‘surf’… which is one feature of Avast that I like! 8) I ‘know’ it is working for me… 
DropMyRights changes nothing in your firefox settings and to all intents and purposes firefox knows no difference other than if there is a function that requires administrator privileges. The only time I found that was on a program update when I needed admin privileges. I have been able to update and install new extensions whilst using FF under dropmyrights.
See for yourself, running FF and no sessionstore.js in the folder so I don’t see how a file that doesn’t exist is constantly updated unless it is in memory only, unlikely I would have thought.
Thanks David. After a long time I’ll give it a test. Better late than never.
Your welcome, I think you will like it as it is relatively unobtrusive, you almost don’t notice it. You can do all the other tasks you would need admin rights and just apply it to applications that connect to the internet directly, e.g browsers, email clients, P2P, IM, etc. There may be some P2P applications that insist on admin rights.
Well… freezed my computer twice… 
I mean, firefox took all CPU running bellow DropMyRights and I have to reset the computer…
Well… I’ll try again with nothing important running in background and when I have a little more time…
I didn’t notice any appreciable difference with any program running under DropMyRights, my firefox has always been heavy on memory, currently 103Mb, but no really high CPU usage, I have seen it peak at 50% when browsing and only for a few seconds whilst pages load.
I wish I had this luck…