Manually Installing Header Extension on Browser (Guide and Tricks)

How To Install Add-on Extension on PC Browser

Mozilla Firefox

First Method
Navigate to → about:addons via Firefox address bar. Drag and drop your header add-on file (modify_headers-0.7.1.1-fx) then click 'Install Now' on the pop-up box, after it is successfully installed again a new pop-up window appear, just click 'Restart'. Click and open Modify Headers (can be seen at the right upper portion of the browser) and insert a working FREE SITE with the given settings and start browsing.

Second Method
Go to → Open menu and click it. Find 'Tools for all add-ons' then click it. After clicking 'Tools for all add-ons' a small box appeared then find 'Install Add-on from File...' and click again. Finally search your file named modify_headers-0.7.1.1-fx.xpi and click 'Install now', after that restart the Firefox browser and your done. You can now insert a working FREE SITE.

Google Chrome

Method 1
Navigate to → chrome://extensions via Chrome address bar. Drag and drop your header add-on file (ModHeader 2.0.4 or Modify Headers for Google Chrome™ 2.0.3) then click 'Add' on the pop-up box and your done. Insert a working FREE SITE with the given settings.

Method 2
Go to → Customize and control Google Chrome and click it. After clicking 'Customize and control' a pop-up window appears then scroll down and locate 'More tools' under 'More tools' a new pop-up window again appear, then locate and click 'Extensions'. The only thing you should do now when we are in 'Extensions' window is to find your add-on extension file (ModHeader 2.0.4 or Modify Headers for Google Chrome™ 2.0.3) then drag and drop it. After dropping the add-on in 'Extensions' window a pop-up box appear,  just click 'Add' and you're ready to go. If got a mistake while doing this, that pop-up box can never be seen. Insert a working FREE SITE and browse the web.