What is Cookies folder "HSTS.plist"?

I am trying to permanently delete all cookies on Yosemite 10.10.3 and am wondering about the folder "HSTS.plist" under User/Library/Cookies. The folder and contents seem to contain several cookies that reappear after rebooting, despite being deleted.
I have the following questions, if anyone can help:
1. What Is the folder HSTS.plist?
2 Is the folder safe to delete?
3. How can I permanently delete it and ALL cookies?
Note that I have repeatedly tried to delete all cookies by selecting Safari/Preferences/Privacy - Remove All Website Data AND Clear History and Website Data. On my IOS 8 devices I have also selected Settings/Safari/Clear History and Website Data and Cookies/Always Block.
On Adobe Flash Player Settings Manager, I have also deselected Allow Third-Party Content To Store Data On Your Computer, maximized privacy settings for all options, and ensured that there are no Flash Player websites and/cookies showing on my computer.

On my system, HSTS.plist appears to contain a list of hosts that have requested secure connections under the HTTP Strict Transport Security protocol (see the WIkipedia entry for "HSTS", for example). It does not contain any data related to my browsing. I would guess that (a) it's safe to delete it, but (b) it will just get recreated or redownloaded the next time you use Safari.
In Terminal, you can use the "plutil" command to examine the contents of the file, e.g.
plutil -convert xml1 -o - HSTS.plist
will show a more-or-less readable version.

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Verizon Wireless Customer Support <[email protected]> wrote:
Verizon Wireless Customer Support created the discussion
"When I open email or texting I am often sent to the Web to either the Playstore to look at a new app or some site that want me to choose some singles site to chat with chick avatar. How do I remove this - what? cookie?"
To view the discussion, visit: https://community.verizonwireless.com/message/1081202#1081202
>

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What is Cookies folder "HSTS.plist"?

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