You can use the button on the "Help -> Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:preferences page. Seeing the browser crash abruptly and losing the browsing session isn’t that bad a thing unless you are not prompted for a restore when you launch your browser again. You can delete the user.js file if you didn't create this file yourself. The user.js file is read each time Firefox is started and initializes preferences to the value specified in this file, so preferences set via user.js can only be changed temporarily for the current session. All that on Windows 7, I don't have Windows 10 - but it shouldn't really matter. ![]() ![]() Solution 2 Open the most recent file (probably sessionstore.js) in an advanced text editor supporting regular expression search and replace (for example, TextPad and Notepad++). Just paste in the contents of sessionstore.bak. You can check its content with a text editor (right-click: "Open with" do not double-click). OP: What if you type about:sessionrestore into the address bar, does the page opening then have this issue as well For reference, I tried Firefox 43, 44, an older Firefox 45.0a1 nightly and the current Firefox 46.0a1 nightly. Solution 1 You can use the utility at to restore your tabs. The user.js file will only be present if you or other software has created this file and normally won't be present. Your System Details list shows that you have a user.js file in the profile folder to initialize prefs each time Firefox starts. You can check if you have a user.js file in the Firefox profile folder that sets the _session_once pref to true.
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