I used Mozilla Firefox on my laptop for more than four months and during my usages I realized that this browser is not suitable for low end Laptops, which have low amount of memory ( i.e - 2GB )
Mozilla Firefox installs two type of software within Firefox Browser. One is the Browser and Second is Mozilla Firefox Maintainance Service. This service collects data and send to Mozilla to improve user experience and provide better value.
But the main reason I avoided this Browser because it usages a sufficient amount of memory from my Laptop which makes my Laptop slow and decreases performance.
Whenever I opened Mozilla Firefox browser it's Maintainance service atuo starts in the background and collects data. It also usage more than 200 MB of memory.
By adding these both I found that Mozilla Firefox usages more than 500 MB of memory due to which my Laptop gets slow. Also my Laptop is not a high end device. So, I uninstalled this Program from my Laptop.
My recommendation is that if you own a high end PC or Laptop then you can go for it and if you have Low end device than don't go for it.
