Very good structure, easy to follow (diagrams and screen dumps helps a lot :-).

The description for adding SENSEI properties in Firefox states:
{{{
extensions.sensei.accounting.symmetric.userKey
Enter the secret key you negotiated with your Framework Provider here.
}}}

But it has not previous in the description been mentioned how to negotiate with ''"your Framework Provider"''. I have no idea what I should put here...

Aha, it came later, may be worth describing to set it to ade0db88dc614623498f5c53c2e1accb8cac84c594e478fe1b822555 in the first place?
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I updated the section. One should enter the secret key during the configuration now. A remark is added in the "Setting up the secret key" section to skip it, if the key is already entered.
 -Osman
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In section "'''Running the Test Application'''" it is described that one should start the server but following the description it is actually already running. I restarted it since earlier in the description we are told how to configure the server as well so I guess a restart is needed?
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Yes, exactly! I extended the sentence so that one should restart the server if it is already running.
 -Osman
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Apart from that: Perfect!