Chrome: Signal is a new extension for Chrome that lets you edit messages in your Gmail inbox, letting you delete the unwanted parts or highlight the important stuff.
Once you install the extension, you'll get three new buttons in your Gmail toolbar: Edit, Highlight, Restore. The first lets you edit any text in the body of a message, including the subject line, but you can't edit details like the sender, timestamp, etc. Similarly, Highlight lets you select and highlight any text in the body. If you want to see the original message, hit Restore; and to go back to your edited message, hit it again.
The Signal web site also claims that changes made in the message are reflected in your default inbox listing of all emails, but that didn't happen for me, even after switching browsers and operating systems.
The extension is pretty useful to help you knock out the unnecessary text in any email and keep the salient details, so that you can refer to it any time in the future without needing to hunt for what you need.
Signal | via The Red Ferret