After i switched cache location to be on ram drive (Z:) by creating user.js with line user_pref("browser.cache.disk.parent_directory", "Z:\\Firefox_Temp"); When i browse websites it works good but often like 10 times a day i get this problem in middle of browsing say i click link or open new tab and there's no connection. It just keeps refreshing forever and then i can click in any existing tab and try to click link and same problem loading forever then saying connection problem. As soon as i restart firefox it works perfectly fine again until this happens in about hour or two. When i really had connection issues in the past i had to reboot my router to restore connection, however even when connection came back firefox was not opening new pages until i restarted firefox. However this time no connection issues but firefox thinks there's no connection. There's some mechanism in firefox for detecting when there's no connection that does not check again if connection if restored or not until firefox restarted that somehow triggers either as bug or there's connection issue for 1 second then it triggers and does not work anymore. I had this going for for a month already.