Network Tweak is an addon that will increase download speed of files in Firefox. The addon involves some minor tweaks that will remove default network usage limit in Firefox.
Once this addon is installed. Go to > Tools > ‘Tweak Network Settings’ option. First you will get a ‘Tweak Warning Window’, just click o.k.
Under, ‘Profiles‘ click on ‘Power‘ button.
This will tweak Firefox Network settings to load web pages faster and increases the maximum simultaneous downloads from any site.
If in case, you want to switch back to default settings. Go to > Tools > ‘Tweak Network Settings’. Click on ‘Default‘ under Profiles. This will restore Firefox Settings to default value.