Twitter Large Images

** Twitter Timeline Images **
Twitter stores images at different sizes. The “normal” size is up to 600×1200 pixels and when you save an image from Twitter, you will often get this normal size even if Twitter has a larger version. This can happen on your home timeline, on lists and on tweets with multiple images. This extension makes sure you always get the largest available version.

Note: this extension does not scale the images, but gets larger originals if they exist. It does nothing if Twitter is already giving you the largest available size (usually when you read someone else’s account). Remember to zoom in on large images to see the full size.

** Usage **
The extension runs automatically. You can toggle it on and off by clicking its icon at the right of the address bar.

There are two ways to see the larger images:
– Drag and drop an image directly from timeline to a folder or the desktop (recommended)
– Right-click the image and select one of the “image” options, such as “Save image as…”

The problem with the second option is that Twitter changes the file names of large images to something like “Image.jpg:large”. This means that files are often saved with a “.jpg-large” extension and you must rename to “.jpg”. Unfortunately this is difficult to fix in an extension.
However, this problem does not affect drag-and-drop, nor the “Copy image” right-click menu option, so use those methods..

** Performance **
When the extension is first run, or when you toggle it, any open Twitter pages will be refreshed when you next view them. These refreshes are a bit slower than normal because it must clear the cache. However, after that Twitter will run normally. Of course you will be looking at larger images, so more data will be downloaded.

** Notes **
Links to twitter images from outside of twitter are also redirected but in rare cases you may need to refresh manually.
The extension needs to “Read your browsing history” because it needs to find which Twitter tabs you already have open.
Source code is here: https://github.com/mike-modoru/twitter-large-images

(This was done as a personal project, so there may be other issues, please report them.)