Unless others are using your Kindle Fire, only your Facebook account will be signed in within the Amazon Silk web browser; as you learned in our "Login to Facebook from Kindle Fire" tutorial, you will be given the option to make (a setting included in the regular Facebook Login, but not found on the mobile Facebook login form). Like the desktop version of Facebook, the mobile version relies on cookies to keep you signed in, and you will be automatically logged out once that cookie expired (and asked to re-enter your credentials the next time you visit any page on Facebook - pages outside your account will load, but include a login form at the top, but any page that requires access to your account will be password-protected). This tutorial explains how to force a logout by "manually" signing out, with some security precautions to follow.
Tip: if you chose to use the "desktop" version of Facebook on your Kindle Fire (as opposed to the mobile-optimized version it uses by default), see our Facebook Logout tutorial as well (but the last section of this tutorial remains relevant).
Start by opening Facebook on your Kindle Fire (either access it from the new tab page, your bookmarks, or the "f" Facebook icon on your favorites carousel on the Home screen. Once you are inside the mobile version of a Facebook page, tap on the "three horizontal bars" icon in the top left corner of the page, as shown on the screenshot below, to show the mobile menu (what corresponds to the left column and sub-menu items on the "regular" (desktop) version of the social networking site).
Once the menu deploys on the left side of the screen, flick to scroll all the way to the bottom; then, tap on "Log Out" link / button - you will not get a confirmation dialog, and Facebook will sign out immediately:
During the process, the "session" will be killed, and any cookie created to allow Facebook to remember your credentials and/or when you signed in will be deleted from the web browser cache, and you will automatically be redirected to "
m.facebook.com", the mobile sign in page / homepage.
Security Tip: now close the browser tab, re-open it, and launch the mobile or regular (desktop) version of Facebook.com - is your email address and/or password automatically entered? If so, read on - this handy feature would actually allow anyone else with access to your Kindle Fire to login to your Facebook.
The fact that Amazon Silk on Kindle Fire automatically offers to remember usernames and passwords is a nice way to spare you from having to open type (on a small keyboard!) your full credentials; unfortunately, it can also pause some security issues if you can't protect physical access to your Kindle. You can delete your remembered Facebook credentials, but that will also delete your bookmarks, browsing history, and logins for all other web forms - Amazon may allow more granularity in the future. If you decide take this step (which cannot be undone!), proceed as follows:
Try it yourself: next time you load Facebook, the login form will be completely blank!