Cannot install addon off-site because "Firefox prevented this site asking you to install the software on your computer.

I try to install GMail Watcher by Sonthakit. It is hosted off site here: https://sites.google.com/site/sonthakit/gmailwatcher

Whenever I try to install the addon by clicking on 'Install the free', Firefox tells me "Firefox prevented this site asking you to install the software on your computer" and does not give me an option to ignore the warning and install it anyway. I clicked on the padlock icon in the address bar and activated all the appropriate permissions, but it will not yet let me install the addon even after restarting Firefox. I have just reset Firefox and use the latest version.

How can I say grass and let me install the Firefox addon?

This is because the part of the page button is loaded into an iframe, as you can see if you click on the button install free
You get only the button allow if this button is located in the home page and not when the button is in an iframe.
One solution is to open this image in a new tab by right clicking the button.

Tags: Firefox

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