Opening last opened sessions when its start, no thumbnails in the new tabs,

my firefox always opening all last opened sessions when its start,
no thumbnails in the new tabs, its really blank tab, there is no toogle to open thumbnails
i try to "restore to default" in option menu, its only fixed the "opening last opened sessions"
then i try to reset firefox and it solve the problems in a time
then i restart my computer, start firefox, and all the problems came back again
is there any solutions without reintalling my firefox?
Thanks

What is the Startup setting?
*Options > General > Startup: Home page
Is that "Show my windows and tabs from last time" or one of the others?
You can check if you have a user.js file in the Firefox profile folder that sets the browser.sessionstore.resume_session_once pref to true.
*http://kb.mozillazine.org/browser.sessionstore.resume_session_once
You can use this button to go to the currently used Firefox profile folder:
*Help > Troubleshooting Information > Profile Directory: Show Folder (Linux: Open Directory; Mac: Show in Finder)
You can also check the settings for "Clear history when Firefox closes" in case this feature is enabled and if enabled then disable this as a test (i.e. remove the checkmark).
*Tools > Options > Privacy > Firefox will: "Use custom settings for history": [ ] "Clear history when Firefox closes" > Settings
*https://support.mozilla.org/kb/remove-browsing-search-and-download-history
Make sure that the disk cache is enabled and working because the thumbnails on the about:newtab page are generated from the disk cache. You can check the on the about:cache page (there should be disk cache section).

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Opening last opened sessions when its start, no thumbnails in the new tabs,

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