To take a full screenshot and open in Photoshop:
...
Google Chrome permissions [extract]:
You don't need our permission when you want to use an unaltered screenshot of our homepage (Google.com) or the search results page for instructional or illustrative purposes. This applies for print (book, magazine, journal, newspaper) or digital (web page, DVD, CD) formats. Please see below for exceptions to this rule for some of our other products.
https://www.google.com.au/permissions/using-product-graphics.html
...
e.g. Microsoft Word screenshot used with permission from Microsoft.
Adobe <product name> screenshot reprinted with permission from Adobe Systems Incorporated http://www.adobe.com/au/legal/permissions/images-user-guides.html.
e.g. Adobe Dreamweaver screenshot reprinted with permission from Adobe Systems Incorporated.
Screenshots of copyrighted software
Use the Wikipedia guidelines for non-free software screenshots to guide you: https://en.wikipedia.org/wiki/Wikipedia:Non-free_use_rationale_guideline
Cover up any product names, e.g.
Attribution used for this example: Screenshot of licence information for non-free software used for educational purposes only.