However, the hardware Acceleration feature inside the Firefox browser can reduce the stress on your Memory if a dedicated graphics card is installed on your system. Flash content requires a memory draw in order to load. Disabled Hardware Acceleration: There are often advertisements on many websites that you might visit and they play Flash Content.These extensions might be malicious or dangerous to the integrity of your computer’s security as well. Sometimes, the extensions can get installed automatically on the browser if you visit a certain site or install a certain program on your computer. Extensions/Themes: If you have installed any extensions or custom themes on the browser it is possible that they might be using more memory due to certain modifications that come with them.