Do you have a specific reason to refresh Firefox ? ---- Yes, you should keep open tabs when you use refresh to create a new profile. You can read the comments to see what is preserved. *https://searchfox.org/mozilla-release/source/browser/components/migration/FirefoxProfileMigrator.jsm You can keep a backup copy of sessionstore.jsonlz4 in the profile folder just to be sure. ---- when you use the refresh feature in Firefox then a new profile is created and some personal data (bookmarks and history, cookies, Form Data, tabs) is automatically imported. The current Firefox profile folder will be moved to an "Old Firefox Data" folder on the desktop. Installed extensions and other customizations (toolbars, prefs) that you have made are lost and need to be redone. It is possible to recover data from the "Old Firefox Data" folder on the desktop, but be cautious not to copy corrupted files to avoid carrying over problems. *https://support.mozilla.org/en-US/kb/refresh-firefox-reset-add-ons-and-settings

I have had security issues, regarding my overall Mac, and page-loading is abnormally slow .