Many people who uses mozilla firefox with low computer resources (RAM..) complain that the firefox takes a lots of time during start-up especially on the first time after the computer restarts. There is software’s available like firefox pre-loader to cache some files of firefox to memory when windows starts. But in my experience it will also slowdown the computer because it takes some RAM to store the firefox files if you do/do not running firefox.
Another decent method I found is a simple change in the firefox settings. This makes firefox load time equal to Google chrome. this web browser (firefox) has a powerful tool in its pocket that allow any users to edit the normal settings that can be opened by simply entering “about:config” in address bar without quotes then hit enter. On reaching the preferences entry you can see the settings as channels.You can simply edit the value of each by right clicking and selecting “modify”.