The Tor Browser / file revision

 /* The test text as octets for reference

  * %83%86%83%6a%83%52%81%5b%83%68%82%cd%81%41%82%b7%82%d7%82%c4%82%cc%95%b6%8e%9a%82%c9%8c%c5%97%4c%82%cc%94%d4%8d%86%82%f0%95%74%97%5e%82%b5%82%dc%82%b7

  */

 /* The test text decoded correctly as Shift_JIS */

 const rightText="\u30E6\u30CB\u30B3\u30FC\u30C9\u306F\u3001\u3059\u3079\u3066\u306E\u6587\u5B57\u306B\u56FA\u6709\u306E\u756A\u53F7\u3092\u4ED8\u4E0E\u3057\u307E\u3059";

 /* The test text decoded incorrectly as Windows-1251. This is the "right" wrong

    text; anything else is unexpected. */

 const wrongText="\u0453\u2020\u0453\u006A\u0453\u0052\u0403\u005B\u0453\u0068\u201A\u041D\u0403\u0041\u201A\u00B7\u201A\u0427\u201A\u0414\u201A\u041C\u2022\u00B6\u040B\u0459\u201A\u0419\u040A\u0415\u2014\u004C\u201A\u041C\u201D\u0424\u040C\u2020\u201A\u0440\u2022\u0074\u2014\u005E\u201A\u00B5\u201A\u042C\u201A\u00B7";

 function testContent(text) {

   is(gBrowser.contentDocument.getElementById("testpar").innerHTML, text,

      "<p> contains expected text");

   is(gBrowser.contentDocument.getElementById("testtextarea").innerHTML, text,

      "<textarea> contains expected text");

   is(gBrowser.contentDocument.getElementById("testinput").value, text,

      "<input> contains expected text");

 }

 function afterOpen() {

   gBrowser.selectedBrowser.removeEventListener("load", afterOpen, true);

   gBrowser.selectedBrowser.addEventListener("load", afterChangeCharset, true);

   /* Test that the content on load is the expected wrong decoding */

   testContent(wrongText);

   /* Force the page encoding to Shift_JIS */

   BrowserSetForcedCharacterSet("Shift_JIS");

 }

 function afterChangeCharset() {

   gBrowser.selectedBrowser.removeEventListener("load", afterChangeCharset, true);

   /* test that the content is decoded correctly */

   testContent(rightText);

   gBrowser.removeCurrentTab();

   finish();

 }

 function test() {

   waitForExplicitFinish();

   // Get the local directory. This needs to be a file: URI because chrome: URIs

   // are always UTF-8 (bug 617339) and we are testing decoding from other

   // charsets.

   var jar = getJar(getRootDirectory(gTestPath));

   var dir = jar ?

               extractJarToTmp(jar) :

               getChromeDir(getResolvedURI(gTestPath));

   var rootDir = Services.io.newFileURI(dir).spec;

   gBrowser.selectedTab = gBrowser.addTab(rootDir + "test-form_sjis.html");

   gBrowser.selectedBrowser.addEventListener("load", afterOpen, true);

 }