Open Panels by Psychpsyo

This is an add-on made for twitter which enables you to view and post tweets with images that reach outside of their boundaries.

If you just want to view these tweets all you have to do is install the add-on and refresh twitter.
If you ever encounter a tweet made with this that is obscuring important information, hover over it with you mouse and press Alt+P.

If you want to hide all open panels on the site you're currently on, you can use Alt+Shift+P. (note that this only hides them once. As soon as the tweets get reloaded the open panels will be reloaded as well.)
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If you want to use this to create open panel tweets you can click on the new hotbar icon on twitter.
This will bring you to the open panel creator where you can specify an image, and where it should be positioned. Once you've done that, click "Generate Image" to get an image that is ready to post or "Generate Customizable Image" to get an image with transparency so you can put whatever you want in the center.
After that, just right click the image and select "Save Image As..." to download it.

IMPORTANT:
If you customize your image, make sure that you keep it as a .png, don't change the resolution and don't alter the borders.
If you do any of these, Open Panels will not be able to recognize the image afterwards!
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About the "Access your data for all websites" permission:
Open Panels needs this permission because the images for open panel tweets have to be loaded from sites that aren't twitter. By default, your browser would prevent this for security reasons but this permission allows Open Panels to load the images from sites that aren't twitter.
"But isn't that a security risk?"
To make this safe, the add-on only loads images from a few, whitelisted pages. (mainly art, social media and image-sharing sites)