# Firefox – Stop Firefox’s Session Restore from Loading All the Tabs at Once

browser-tabsfirefoxfirefox-extensions

When I use Firefox I often have many tabs and many windows open (even more so now that they have panorama). I often use the session restore feature because I don't want to loose all my open windows when installing a new add on or restarting my computer for updates. However, with so many tabs open it takes a really, really long time for Firefox to load all the tabs. I'm looking for an extension that will open a place holder tab for all of the websites on session restore but won't actually load the page until I click on that tab to bring it to focus. Basically it would like like I had 40 tabs open but until I click on that tab it won't be taking up any more memory than an about:blank page.

Another more reliable way is to use the new about:config property, browser.sessionstore.max_concurrent_tabs.
Go to about:config in firefox and search for browser.sessionstore.max_concurrent_tabs. Set the integer value to 0.