Add blueprint.

wiki/src/blueprint/sandbox_the_web_browser.mdwn

+Related pages
+=============
+
+* [[!tails_ticket 5525]]
+* [[blueprint/Mandatory_Access_Control]]
+* [[contribute/design/application_isolation]]
+
+Status
+======
+
+## automated test passes
+
+* feature/i2p (unconfined)
+* feature/torified_browsing
+* feature/unsafe_browser (unconfined)
+* feature/windows_camouflage
+
+## manual test OK
+
+* add NoScript exception
+* change stuff in about:prefs
+* manually update AdBlock Plus lists
+
+## manual test OK, maybe needs automated test
+
+* download to ~/Downloads
+* YouTube audio and video playback
+* non-YouTube HTML5 video playback
+* "Tails documentation" link on the Desktop ([[!tails_ticket 8788]])
+
+## broken
+
+* persistent bookmarks, RO ([[!tails_ticket 8787]])
+
+## needs testing
+
+* open link from Pidgin
+* upload from Downloads
+* feature/usb_install
+  - persistent bookmarks, RW
+* import OpenPGP key from website (if supported in 1.2.3)
+* click email address on a website (if supported in 1.2.3)
+* install a Firefox add-on (this does not mean we actively support that, right? :)