Improve Firefox Memory Usage By Using Silent Tabs

Update as of 2023: This add-on is now depreciated. With many tabs opened in Firefox for a prolonged period, it can consume a lot of memory. Open Link In Silent Tab is a useful add-on that will open web pages in different tabs but not load them unless they are clicked upon. [This is similar to what happens when restoring previous sessions in Firefox where in tabs from before are visible on restore but...