Change local files security policy

Firefox:

Go to about:config (type the address in the Firefox navigation bar)
Find security.fileuri.strict_origin_policy parameter
Set it to false

Chrome:

Close all running Chrome instances first. The important word here is ‘all’. On Windows, you may check for Chrome instances using the Windows Task Manager. Alternatively, if you see a Chrome icon in the system tray, then you may open its context menu and click ‘Exit’. This should close all Chrome instances.
Start a command prompt / terminal. On Windows, type Command Prompt in the Search box, and then, in the list of results, double-click Command Prompt.
Find the Chrome executable folder. On Windows, search for the file chrome.exe in a Navigator windows.
In the command prompt terminal, start the Chrome executable with a command line flag: path_to_chrome/chrome --allow-file-access-from-files

Internet Explorer

Theoretically, Internet Explorer allows changes in the local files security policy. However, in our tests the options had no effect under Windows 8.0.

Safari

Enable the develop menu using the preferences panel, under Advanced → "Show develop menu in menu bar".
Then from the Safari "Develop" menu, select "Disable local file restrictions".
If you are editing & debugging using Safari, it is advisable to also select the "Disable caches" option in the same menu.