What is the Firefox equivalent of Windows' %username%?

I'm trying to setup username variables in about:config, notably default download location and browser.cache.disk.parent_directory . When I use the standard %username% variable in these settings, Firefox interprets them literally. Does Firefox have an equivalent %username% variable?
== This happened ==
Every time Firefox opened
== Always

An extension should be able to do that quite easily.<br />
Try this code in the Tools Error Console.<br />
You can create an extension to make the change.
<pre><nowiki>const Cc = Components.classes, Ci = Components.interfaces;
var PB = Cc["@mozilla.org/preferences-service;1"].getService(Ci.nsIPrefService).getBranch("");
var PN = "browser.cache.disk.parent_directory";
var curVal = PB.getCharPref(PN);
var userName = Cc["@mozilla.org/process/environment;1"].getService(Ci.nsIEnvironment).get('USERNAME');
newVal = curVal.replace(/%USERNAME%/i, userName);
PB.setCharPref(PN, newVal);
</nowiki></pre>
See also:
* https://developer.mozilla.org/en/nsIPrefBranch
* https://developer.mozilla.org/en/NsIEnvironment

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''jasonf [[#question-1041305|said]]''
<blockquote>
How do I pin a website to the Firefox jumplist in Windows 8? I am using Firefox version 35. I have one pinned site on my Firefox taskbar jumplist, but can't figure out how to add additional sites.
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</blockquote>
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