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About this Add-on
Due to Mozilla's decision of not making accessible low apis to addon developers this addon will be useless on Firefox 57.
You will be still able to change the settings of mixed content by changing the preference on about:config but not able to toggle it via the button of this addon.
I'll watch the new webextention apis in order to update and make again this addon useful. However the impression I have is that is not going to happen any time soon.
An icon that toggles the preference of blocking mixed active content.
Preference Name: security.mixed_content.block_active_content
red icon --> false
green icon --> true
Note: It doesn't change the icon if the user manually changes the preference in about:config page. However if this happens, click on the icon toggles the preference value and shows the right icon.
Note: The API of Addon SDK is unstable which means that there is possibility of future breakage of this addon's functionality. I will try to stay updated for any relative changes and update accordingly this addon.