Using Photoshop 2014.2.0 Release on Windows, I created a new image with color mode RGB color - 8bit and color profile sRGB. I deleted my PS settings to reset it all to default.
On the Color picker I choose RGB and introduced: 203,55,55 (or cb3737 in HEX).
Using Color Cop (a tool to get colors from any pixel on screen) if I try to see the color used on the little 'preview' square on photoshop I get color E42829 which is different from my intended CB3737. I can also notice the difference in color tone with my eyes.
Using the browser to check color #CB3737 I can also notice the difference between color shown in Photoshop and in other tools. I know browsers have issues with colors so I'm not trusting them a lot, just another example.
What is going on and why do I 'select' a color in Photoshop that is then translated into another another in the same app (preview square). I read a bit about color profiles but I am a bit surprised with this "voodoo.
I don't remember having anything fancy related to color profile on my Windows but maybe sometimes drivers can change those things. I only work with graphics designed to be shown on web.