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Firefox opened a site from a browsing session days ago upon start (not from the last browsing session)

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I thought this occurrence was odd. I'm running Firefox 28.0 on Windows 8, and I re-opened Firefox this evening around 9pm after waking my computer from sleep mode. Instead of showing tabs from the immediate last session that I closed around 5pm, it showed the login website for my student e-mail account. This was odd because I haven't been on that page from this computer in 3 days, and viewing my Recent History confirms that. At first, I thought perhaps someone was using the computer in that time, but the Recent History and the Event Viewer don't show any browser or computer activity between the time that I ended the session at 5pm when the computer went into sleep mode and the time that I began the new session around 9pm. I also have a Session Manager plug-in and it confirms that the immediate last session was not that student e-mail login website. What would cause this to happen? It seems weird.

I thought this occurrence was odd. I'm running Firefox 28.0 on Windows 8, and I re-opened Firefox this evening around 9pm after waking my computer from sleep mode. Instead of showing tabs from the immediate last session that I closed around 5pm, it showed the login website for my student e-mail account. This was odd because I haven't been on that page from this computer in 3 days, and viewing my Recent History confirms that. At first, I thought perhaps someone was using the computer in that time, but the Recent History and the Event Viewer don't show any browser or computer activity between the time that I ended the session at 5pm when the computer went into sleep mode and the time that I began the new session around 9pm. I also have a Session Manager plug-in and it confirms that the immediate last session was not that student e-mail login website. What would cause this to happen? It seems weird.

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Go Firefox Options > General. Check the setting under; When Firefox Starts.

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You can check for problems with the sessionstore.js and sessionstore.bak files in the Firefox profile folder that store session data.

Rename (or delete) the sessionstore.js file and possible sessionstore-##.js files with a number and sessionstore.bak in the Firefox profile folder.

Deleting sessionstore.js will cause App Tabs and Tab Groups and open and closed (undo) tabs to get lost and you will have to recreate them (make a note or bookmark them if possible).