User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36 Steps to reproduce: I can reproduce on Firefox 50.1.0 and also Firefox Nightly 54.0a1 (2017-01-25) (64-bit) by following these steps: 1. Head to https://jsfiddle.net/SamMiller/ubm10f69/ 2. Double click on "PURPLE". 3. Press ctrl + c to copy the selection to the clipboard. 4. Click within the red HTML checker content editable box 5. Press ctrl + v to paste the clipboard contents into the HTML checker box. (If I click and drag the selection from the start of "PURPLE" to the end of "BLUE", copy that to the clipboard using ctrl + c, and paste it into the HTML checker box, both the purple and the blue background colours, including the text, are pasted into the box). Actual results: "PURPLE" is copied into the box but the purple background colour is missing. Expected results: The purple background colour should of been pasted with the "PURPLE" text.
OS: Unspecified → Windows 10
Hardware: Unspecified → x86_64
User Agent: Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:54.0) Gecko/20100101 Firefox/54.0 I have tested your issue on Window 8.1 x64 with latest Firefox release v51.0.1, latest Nightly (Build ID: 20170129110302) and managed to reproduce it. On Chrome the text is pasted also with the background color. This issue is also reproducible on Ubuntu 14.04 and Mac OS X 10.12.
Status: UNCONFIRMED → NEW
Component: Untriaged → XP Toolkit/Widgets: XUL
Ever confirmed: true
OS: Windows 10 → All
Product: Firefox → Core
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