Check iframe por CarlosAMolina

GitHub: https://github.com/carlosamolina/checkiframe

## Introduction

This is a Firefox add-on to work with iframe and frame tags:

- Indicate if the current web page uses iframe and frame tags by changing the colour of the add-on icon.
- Scroll the window to the elements with tags and highlight them with a red border.
- Redirection. A list of sites where the add-on will apply a redirection automatically to the first iframe/frame source can be configured.

The meaning of the icon's colours is:

- Blue icon: the website cannot be checked.
- Green icon: no tag iframe or frame detected.
- Orange icon: tag detected.
- Purple icon: tag detected and at least one source matches with any term in the configured user's list of special sources to notify.

## Documentation

Please, read the docs to know how to configure the add-on, work with it and more information:

https://cmoli.es/projects/check-iframe/introduction.html