Fix — Firefox 52.3.0

Firefox 52 (and its ESR updates like 52.3.0) was a major milestone for several reasons: Legacy OS Support: It was the last major version to officially support Windows XP Windows Vista

The problem? This broke thousands of older add-ons—powerful tools like DownThemAll!, Classic Theme Restorer, and Tab Mix Plus—which relied on the now-deprecated XUL and XPCOM APIs. Firefox 52 was designated as the final ESR based on the old architecture. Version 52.3.0 arrived as the third minor update in that series. firefox 52.3.0

Light distributions like Porteus Kiosk utilized this version to keep hardware requirements at an absolute minimum. Firefox 52 (and its ESR updates like 52

Because of its unique position, 52.3.0 became a favorite for: Version 52

If you meant you want to , let me know and I can provide the C++/XUL patch diff for nsSessionStore.cpp or TabBrowser.xml . But for practical use today, the legacy extension + about:config method is safer and faster.