hallo, je kunt je bladwijzers als volgt vinden https://support.mozilla.org/nl/kb/verdwenen-of-ontbrekende-bladwijzers-herstellen #fxhelp #Firefox64SUMOWeek

If you recently had reset Firefox then Firefox may have reverted to an older profile. Note that using System Restore can cause your Firefox installation to get corrupted because only white-listed files are restored. *always be cautious with using System Restore. *you may lose data in the Firefox profile folder like .js and .ini files *you may have to reinstall affected software ---- You can look at this utility to browse System Restore points to see if you can locate missing files. *System Restore Explorer<br>http://nicbedford.co.uk/software/systemrestoreexplorer/ You can use the button on the "Help -> Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the <b>about:profiles</b> page. *Help -> Troubleshooting Information -> Profile Directory:<br>Windows: Show Folder; Linux: Open Directory; Mac: Show in Finder *http://kb.mozillazine.org/Profile_folder_-_Firefox You can search for these files to recover specific data. *bookmarks and history: places.sqlite *bookmark backups: compressed .jsonlz4 JSON backups in the bookmarkbackups folder *cookies.sqlite for the Cookies *formhistory.sqlite for saved autocomplete Form Data *logins.json (passwords) and key4.db (58+) or key3.db (57 and older) (decryption key) for Passwords saved in the Password Manager<br>if you only have key3.db then make sure to remove an existing key4.db *cert9.db (58+) or cert8.db (57 and older) for (intermediate) certificates stored in the Certificate Manager<br>if you only have cert8.db then make sure to remove an existing cert9.db *persdict.dat for words you added to the spelling checker dictionary *permissions.sqlite for Permissions and possibly content-prefs.sqlite for other website specific data (Site Preferences) *sessionstore.jsonlz4 for open tabs and pinned tabs (see also the sessionstore-backups folder)