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diff --git a/netwerk/test/unit/test_MIME_params.js b/netwerk/test/unit/test_MIME_params.js
new file mode 100644
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+++ b/netwerk/test/unit/test_MIME_params.js
@@ -0,0 +1,784 @@
+/**
+ * Tests for parsing header fields using the syntax used in
+ * Content-Disposition and Content-Type
+ *
+ * See also https://bugzilla.mozilla.org/show_bug.cgi?id=609667
+ */
+
+"use strict";
+
+var BS = "\\";
+var DQUOTE = '"';
+
+// Test array:
+//  - element 0: "Content-Disposition" header to test
+//  under MIME (email):
+//  - element 1: correct value returned for disposition-type (empty param name)
+//  - element 2: correct value for filename returned
+//  under HTTP:
+// (currently supports continuations; expected results without continuations
+// are commented out for now)
+//  - element 3: correct value returned for disposition-type (empty param name)
+//  - element 4: correct value for filename returned
+//
+// 3 and 4 may be left out if they are identical
+
+var tests = [
+  // No filename parameter: return nothing
+  ["attachment;", "attachment", Cr.NS_ERROR_INVALID_ARG],
+
+  // basic
+  ["attachment; filename=basic", "attachment", "basic"],
+
+  // extended
+  ["attachment; filename*=UTF-8''extended", "attachment", "extended"],
+
+  // prefer extended to basic (bug 588781)
+  [
+    "attachment; filename=basic; filename*=UTF-8''extended",
+    "attachment",
+    "extended",
+  ],
+
+  // prefer extended to basic (bug 588781)
+  [
+    "attachment; filename*=UTF-8''extended; filename=basic",
+    "attachment",
+    "extended",
+  ],
+
+  // use first basic value (invalid; error recovery)
+  ["attachment; filename=first; filename=wrong", "attachment", "first"],
+
+  // old school bad HTTP servers: missing 'attachment' or 'inline'
+  // (invalid; error recovery)
+  ["filename=old", "filename=old", "old"],
+
+  ["attachment; filename*=UTF-8''extended", "attachment", "extended"],
+
+  // continuations not part of RFC 5987 (bug 610054)
+  [
+    "attachment; filename*0=foo; filename*1=bar",
+    "attachment",
+    "foobar",
+    /* "attachment", Cr.NS_ERROR_INVALID_ARG */
+  ],
+
+  // Return first continuation (invalid; error recovery)
+  [
+    "attachment; filename*0=first; filename*0=wrong; filename=basic",
+    "attachment",
+    "first",
+    /* "attachment", "basic" */
+  ],
+
+  // Only use correctly ordered continuations  (invalid; error recovery)
+  [
+    "attachment; filename*0=first; filename*1=second; filename*0=wrong",
+    "attachment",
+    "firstsecond",
+    /* "attachment", Cr.NS_ERROR_INVALID_ARG */
+  ],
+
+  // prefer continuation to basic (unless RFC 5987)
+  [
+    "attachment; filename=basic; filename*0=foo; filename*1=bar",
+    "attachment",
+    "foobar",
+    /* "attachment", "basic" */
+  ],
+
+  // Prefer extended to basic and/or (broken or not) continuation
+  // (invalid; error recovery)
+  [
+    "attachment; filename=basic; filename*0=first; filename*0=wrong; filename*=UTF-8''extended",
+    "attachment",
+    "extended",
+  ],
+
+  // RFC 2231 not clear on correct outcome: we prefer non-continued extended
+  // (invalid; error recovery)
+  [
+    "attachment; filename=basic; filename*=UTF-8''extended; filename*0=foo; filename*1=bar",
+    "attachment",
+    "extended",
+  ],
+
+  // Gaps should result in returning only value until gap hit
+  // (invalid; error recovery)
+  [
+    "attachment; filename*0=foo; filename*2=bar",
+    "attachment",
+    "foo",
+    /* "attachment", Cr.NS_ERROR_INVALID_ARG */
+  ],
+
+  // Don't allow leading 0's (*01) (invalid; error recovery)
+  [
+    "attachment; filename*0=foo; filename*01=bar",
+    "attachment",
+    "foo",
+    /* "attachment", Cr.NS_ERROR_INVALID_ARG */
+  ],
+
+  // continuations should prevail over non-extended (unless RFC 5987)
+  [
+    "attachment; filename=basic; filename*0*=UTF-8''multi;\r\n" +
+      " filename*1=line;\r\n" +
+      " filename*2*=%20extended",
+    "attachment",
+    "multiline extended",
+    /* "attachment", "basic" */
+  ],
+
+  // Gaps should result in returning only value until gap hit
+  // (invalid; error recovery)
+  [
+    "attachment; filename=basic; filename*0*=UTF-8''multi;\r\n" +
+      " filename*1=line;\r\n" +
+      " filename*3*=%20extended",
+    "attachment",
+    "multiline",
+    /* "attachment", "basic" */
+  ],
+
+  // First series, only please, and don't slurp up higher elements (*2 in this
+  // case) from later series into earlier one (invalid; error recovery)
+  [
+    "attachment; filename=basic; filename*0*=UTF-8''multi;\r\n" +
+      " filename*1=line;\r\n" +
+      " filename*0*=UTF-8''wrong;\r\n" +
+      " filename*1=bad;\r\n" +
+      " filename*2=evil",
+    "attachment",
+    "multiline",
+    /* "attachment", "basic" */
+  ],
+
+  // RFC 2231 not clear on correct outcome: we prefer non-continued extended
+  // (invalid; error recovery)
+  [
+    "attachment; filename=basic; filename*0=UTF-8''multi\r\n;" +
+      " filename*=UTF-8''extended;\r\n" +
+      " filename*1=line;\r\n" +
+      " filename*2*=%20extended",
+    "attachment",
+    "extended",
+  ],
+
+  // sneaky: if unescaped, make sure we leave UTF-8'' in value
+  [
+    "attachment; filename*0=UTF-8''unescaped;\r\n" +
+      " filename*1*=%20so%20includes%20UTF-8''%20in%20value",
+    "attachment",
+    "UTF-8''unescaped so includes UTF-8'' in value",
+    /* "attachment", Cr.NS_ERROR_INVALID_ARG */
+  ],
+
+  // sneaky: if unescaped, make sure we leave UTF-8'' in value
+  [
+    "attachment; filename=basic; filename*0=UTF-8''unescaped;\r\n" +
+      " filename*1*=%20so%20includes%20UTF-8''%20in%20value",
+    "attachment",
+    "UTF-8''unescaped so includes UTF-8'' in value",
+    /* "attachment", "basic" */
+  ],
+
+  // Prefer basic over invalid continuation
+  // (invalid; error recovery)
+  [
+    "attachment; filename=basic; filename*1=multi;\r\n" +
+      " filename*2=line;\r\n" +
+      " filename*3*=%20extended",
+    "attachment",
+    "basic",
+  ],
+
+  // support digits over 10
+  [
+    "attachment; filename=basic; filename*0*=UTF-8''0;\r\n" +
+      " filename*1=1; filename*2=2;filename*3=3;filename*4=4;filename*5=5;\r\n" +
+      " filename*6=6; filename*7=7;filename*8=8;filename*9=9;filename*10=a;\r\n" +
+      " filename*11=b; filename*12=c;filename*13=d;filename*14=e;filename*15=f\r\n",
+    "attachment",
+    "0123456789abcdef",
+    /* "attachment", "basic" */
+  ],
+
+  // support digits over 10 (detect gaps)
+  [
+    "attachment; filename=basic; filename*0*=UTF-8''0;\r\n" +
+      " filename*1=1; filename*2=2;filename*3=3;filename*4=4;filename*5=5;\r\n" +
+      " filename*6=6; filename*7=7;filename*8=8;filename*9=9;filename*10=a;\r\n" +
+      " filename*11=b; filename*12=c;filename*14=e\r\n",
+    "attachment",
+    "0123456789abc",
+    /* "attachment", "basic" */
+  ],
+
+  // return nothing: invalid
+  // (invalid; error recovery)
+  [
+    "attachment; filename*1=multi;\r\n" +
+      " filename*2=line;\r\n" +
+      " filename*3*=%20extended",
+    "attachment",
+    Cr.NS_ERROR_INVALID_ARG,
+  ],
+
+  // Bug 272541: Empty disposition type treated as "attachment"
+
+  // sanity check
+  [
+    "attachment; filename=foo.html",
+    "attachment",
+    "foo.html",
+    "attachment",
+    "foo.html",
+  ],
+
+  // the actual bug
+  [
+    "; filename=foo.html",
+    Cr.NS_ERROR_FIRST_HEADER_FIELD_COMPONENT_EMPTY,
+    "foo.html",
+    Cr.NS_ERROR_FIRST_HEADER_FIELD_COMPONENT_EMPTY,
+    "foo.html",
+  ],
+
+  // regression check, but see bug 671204
+  [
+    "filename=foo.html",
+    "filename=foo.html",
+    "foo.html",
+    "filename=foo.html",
+    "foo.html",
+  ],
+
+  // Bug 384571: RFC 2231 parameters not decoded when appearing in reversed order
+
+  // check ordering
+  [
+    "attachment; filename=basic; filename*0*=UTF-8''0;\r\n" +
+      " filename*1=1; filename*2=2;filename*3=3;filename*4=4;filename*5=5;\r\n" +
+      " filename*6=6; filename*7=7;filename*8=8;filename*9=9;filename*10=a;\r\n" +
+      " filename*11=b; filename*12=c;filename*13=d;filename*15=f;filename*14=e;\r\n",
+    "attachment",
+    "0123456789abcdef",
+    /* "attachment", "basic" */
+  ],
+
+  // check non-digits in sequence numbers
+  [
+    "attachment; filename=basic; filename*0*=UTF-8''0;\r\n" +
+      " filename*1a=1\r\n",
+    "attachment",
+    "0",
+    /* "attachment", "basic" */
+  ],
+
+  // check duplicate sequence numbers
+  [
+    "attachment; filename=basic; filename*0*=UTF-8''0;\r\n" +
+      " filename*0=bad; filename*1=1;\r\n",
+    "attachment",
+    "0",
+    /* "attachment", "basic" */
+  ],
+
+  // check overflow
+  [
+    "attachment; filename=basic; filename*0*=UTF-8''0;\r\n" +
+      " filename*11111111111111111111111111111111111111111111111111111111111=1",
+    "attachment",
+    "0",
+    /* "attachment", "basic" */
+  ],
+
+  // check underflow
+  [
+    // eslint-disable-next-line no-useless-concat
+    "attachment; filename=basic; filename*0*=UTF-8''0;\r\n" + " filename*-1=1",
+    "attachment",
+    "0",
+    /* "attachment", "basic" */
+  ],
+
+  // check mixed token/quoted-string
+  [
+    'attachment; filename=basic; filename*0="0";\r\n' +
+      " filename*1=1;\r\n" +
+      " filename*2*=%32",
+    "attachment",
+    "012",
+    /* "attachment", "basic" */
+  ],
+
+  // check empty sequence number
+  [
+    "attachment; filename=basic; filename**=UTF-8''0\r\n",
+    "attachment",
+    "basic",
+    "attachment",
+    "basic",
+  ],
+
+  // Bug 419157: ensure that a MIME parameter with no charset information
+  // fallbacks to Latin-1
+
+  [
+    "attachment;filename=IT839\x04\xB5(m8)2.pdf;",
+    "attachment",
+    "IT839\u0004\u00b5(m8)2.pdf",
+  ],
+
+  // Bug 588389: unescaping backslashes in quoted string parameters
+
+  // '\"', should be parsed as '"'
+  [
+    "attachment; filename=" + DQUOTE + (BS + DQUOTE) + DQUOTE,
+    "attachment",
+    DQUOTE,
+  ],
+
+  // 'a\"b', should be parsed as 'a"b'
+  [
+    "attachment; filename=" + DQUOTE + "a" + (BS + DQUOTE) + "b" + DQUOTE,
+    "attachment",
+    "a" + DQUOTE + "b",
+  ],
+
+  // '\x', should be parsed as 'x'
+  ["attachment; filename=" + DQUOTE + (BS + "x") + DQUOTE, "attachment", "x"],
+
+  // test empty param (quoted-string)
+  ["attachment; filename=" + DQUOTE + DQUOTE, "attachment", ""],
+
+  // test empty param
+  ["attachment; filename=", "attachment", ""],
+
+  // Bug 601933: RFC 2047 does not apply to parameters (at least in HTTP)
+  [
+    "attachment; filename==?ISO-8859-1?Q?foo-=E4.html?=",
+    "attachment",
+    "foo-\u00e4.html",
+    /* "attachment", "=?ISO-8859-1?Q?foo-=E4.html?=" */
+  ],
+
+  [
+    'attachment; filename="=?ISO-8859-1?Q?foo-=E4.html?="',
+    "attachment",
+    "foo-\u00e4.html",
+    /* "attachment", "=?ISO-8859-1?Q?foo-=E4.html?=" */
+  ],
+
+  // format sent by GMail as of 2012-07-23 (5987 overrides 2047)
+  [
+    "attachment; filename=\"=?ISO-8859-1?Q?foo-=E4.html?=\"; filename*=UTF-8''5987",
+    "attachment",
+    "5987",
+  ],
+
+  // Bug 651185: double quotes around 2231/5987 encoded param
+  // Change reverted to backwards compat issues with various web services,
+  // such as OWA (Bug 703015), plus similar problems in Thunderbird. If this
+  // is tried again in the future, email probably needs to be special-cased.
+
+  // sanity check
+  ["attachment; filename*=utf-8''%41", "attachment", "A"],
+
+  // the actual bug
+  [
+    "attachment; filename*=" + DQUOTE + "utf-8''%41" + DQUOTE,
+    "attachment",
+    "A",
+  ],
+  // previously with the fix for 651185:
+  // "attachment", Cr.NS_ERROR_INVALID_ARG],
+
+  // Bug 670333: Content-Disposition parser does not require presence of "="
+  // in params
+
+  // sanity check
+  ["attachment; filename*=UTF-8''foo-%41.html", "attachment", "foo-A.html"],
+
+  // the actual bug
+  [
+    "attachment; filename *=UTF-8''foo-%41.html",
+    "attachment",
+    Cr.NS_ERROR_INVALID_ARG,
+  ],
+
+  // the actual bug, without 2231/5987 encoding
+  ["attachment; filename X", "attachment", Cr.NS_ERROR_INVALID_ARG],
+
+  // sanity check with WS on both sides
+  ["attachment; filename = foo-A.html", "attachment", "foo-A.html"],
+
+  // Bug 685192: in RFC2231/5987 encoding, a missing charset field should be
+  // treated as error
+
+  // the actual bug
+  ["attachment; filename*=''foo", "attachment", "foo"],
+  // previously with the fix for 692574:
+  // "attachment", Cr.NS_ERROR_INVALID_ARG],
+
+  // sanity check
+  ["attachment; filename*=a''foo", "attachment", "foo"],
+
+  // Bug 692574: RFC2231/5987 decoding should not tolerate missing single
+  // quotes
+
+  // one missing
+  ["attachment; filename*=UTF-8'foo-%41.html", "attachment", "foo-A.html"],
+  // previously with the fix for 692574:
+  // "attachment", Cr.NS_ERROR_INVALID_ARG],
+
+  // both missing
+  ["attachment; filename*=foo-%41.html", "attachment", "foo-A.html"],
+  // previously with the fix for 692574:
+  // "attachment", Cr.NS_ERROR_INVALID_ARG],
+
+  // make sure fallback works
+  [
+    "attachment; filename*=UTF-8'foo-%41.html; filename=bar.html",
+    "attachment",
+    "foo-A.html",
+  ],
+  // previously with the fix for 692574:
+  // "attachment", "bar.html"],
+
+  // Bug 693806: RFC2231/5987 encoding: charset information should be treated
+  // as authoritative
+
+  // UTF-8 labeled ISO-8859-1
+  ["attachment; filename*=ISO-8859-1''%c3%a4", "attachment", "\u00c3\u00a4"],
+
+  // UTF-8 labeled ISO-8859-1, but with octets not allowed in ISO-8859-1
+  // accepts x82, understands it as Win1252, maps it to Unicode \u20a1
+  [
+    "attachment; filename*=ISO-8859-1''%e2%82%ac",
+    "attachment",
+    "\u00e2\u201a\u00ac",
+  ],
+
+  // defective UTF-8
+  ["attachment; filename*=UTF-8''A%e4B", "attachment", Cr.NS_ERROR_INVALID_ARG],
+
+  // defective UTF-8, with fallback
+  [
+    "attachment; filename*=UTF-8''A%e4B; filename=fallback",
+    "attachment",
+    "fallback",
+  ],
+
+  // defective UTF-8 (continuations), with fallback
+  [
+    "attachment; filename*0*=UTF-8''A%e4B; filename=fallback",
+    "attachment",
+    "fallback",
+  ],
+
+  // check that charsets aren't mixed up
+  [
+    "attachment; filename*0*=ISO-8859-15''euro-sign%3d%a4; filename*=ISO-8859-1''currency-sign%3d%a4",
+    "attachment",
+    "currency-sign=\u00a4",
+  ],
+
+  // same as above, except reversed
+  [
+    "attachment; filename*=ISO-8859-1''currency-sign%3d%a4; filename*0*=ISO-8859-15''euro-sign%3d%a4",
+    "attachment",
+    "currency-sign=\u00a4",
+  ],
+
+  // Bug 704989: add workaround for broken Outlook Web App (OWA)
+  // attachment handling
+
+  ['attachment; filename*="a%20b"', "attachment", "a b"],
+
+  // Bug 717121: crash nsMIMEHeaderParamImpl::DoParameterInternal
+
+  ['attachment; filename="', "attachment", ""],
+
+  // We used to read past string if last param w/o = and ;
+  // Note: was only detected on windows PGO builds
+  ["attachment; filename=foo; trouble", "attachment", "foo"],
+
+  // Same, followed by space, hits another case
+  ["attachment; filename=foo; trouble ", "attachment", "foo"],
+
+  ["attachment", "attachment", Cr.NS_ERROR_INVALID_ARG],
+
+  // Bug 730574: quoted-string in RFC2231-continuations not handled
+
+  [
+    'attachment; filename=basic; filename*0="foo"; filename*1="\\b\\a\\r.html"',
+    "attachment",
+    "foobar.html",
+    /* "attachment", "basic" */
+  ],
+
+  // unmatched escape char
+  [
+    'attachment; filename=basic; filename*0="foo"; filename*1="\\b\\a\\',
+    "attachment",
+    "fooba\\",
+    /* "attachment", "basic" */
+  ],
+
+  // Bug 732369: Content-Disposition parser does not require presence of ";" between params
+  // optimally, this would not even return the disposition type "attachment"
+
+  [
+    "attachment; extension=bla filename=foo",
+    "attachment",
+    Cr.NS_ERROR_INVALID_ARG,
+  ],
+
+  // Bug 1440677 - spaces inside filenames ought to be quoted, but too many
+  // servers do the wrong thing and most browsers accept this, so we were
+  // forced to do the same for compat.
+  ["attachment; filename=foo extension=bla", "attachment", "foo extension=bla"],
+
+  ["attachment filename=foo", "attachment", Cr.NS_ERROR_INVALID_ARG],
+
+  // Bug 777687: handling of broken %escapes
+
+  ["attachment; filename*=UTF-8''f%oo; filename=bar", "attachment", "bar"],
+
+  ["attachment; filename*=UTF-8''foo%; filename=bar", "attachment", "bar"],
+
+  // Bug 783502 - xpcshell test netwerk/test/unit/test_MIME_params.js fails on AddressSanitizer
+  ['attachment; filename="\\b\\a\\', "attachment", "ba\\"],
+
+  // Bug 1412213 - do continue to parse, behind an empty parameter
+  ["attachment; ; filename=foo", "attachment", "foo"],
+
+  // Bug 1412213 - do continue to parse, behind a parameter w/o =
+  ["attachment; badparameter; filename=foo", "attachment", "foo"],
+
+  // Bug 1440677 - spaces inside filenames ought to be quoted, but too many
+  // servers do the wrong thing and most browsers accept this, so we were
+  // forced to do the same for compat.
+  ["attachment; filename=foo bar.html", "attachment", "foo bar.html"],
+  // Note: we keep the tab character, but later validation will replace with a space,
+  // as file systems do not like tab characters.
+  ["attachment; filename=foo\tbar.html", "attachment", "foo\tbar.html"],
+  // Newlines get stripped completely (in practice, http header parsing may
+  // munge these into spaces before they get to us, but we should check we deal
+  // with them either way):
+  ["attachment; filename=foo\nbar.html", "attachment", "foobar.html"],
+  ["attachment; filename=foo\r\nbar.html", "attachment", "foobar.html"],
+  ["attachment; filename=foo\rbar.html", "attachment", "foobar.html"],
+
+  // Trailing rubbish shouldn't matter:
+  ["attachment; filename=foo bar; garbage", "attachment", "foo bar"],
+  ["attachment; filename=foo bar; extension=blah", "attachment", "foo bar"],
+
+  // Check that whitespace processing can't crash.
+  ["attachment; filename =      ", "attachment", ""],
+];
+
+var rfc5987paramtests = [
+  [
+    // basic test
+    "UTF-8'language'value",
+    "value",
+    "language",
+    Cr.NS_OK,
+  ],
+  [
+    // percent decoding
+    "UTF-8''1%202",
+    "1 2",
+    "",
+    Cr.NS_OK,
+  ],
+  [
+    // UTF-8
+    "UTF-8''%c2%a3%20and%20%e2%82%ac%20rates",
+    "\u00a3 and \u20ac rates",
+    "",
+    Cr.NS_OK,
+  ],
+  [
+    // missing charset
+    "''abc",
+    "",
+    "",
+    Cr.NS_ERROR_INVALID_ARG,
+  ],
+  [
+    // ISO-8859-1: unsupported
+    "ISO-8859-1''%A3%20rates",
+    "",
+    "",
+    Cr.NS_ERROR_INVALID_ARG,
+  ],
+  [
+    // unknown charset
+    "foo''abc",
+    "",
+    "",
+    Cr.NS_ERROR_INVALID_ARG,
+  ],
+  [
+    // missing component
+    "abc",
+    "",
+    "",
+    Cr.NS_ERROR_INVALID_ARG,
+  ],
+  [
+    // missing component
+    "'abc",
+    "",
+    "",
+    Cr.NS_ERROR_INVALID_ARG,
+  ],
+  [
+    // illegal chars
+    "UTF-8''a b",
+    "",
+    "",
+    Cr.NS_ERROR_INVALID_ARG,
+  ],
+  [
+    // broken % escapes
+    "UTF-8''a%zz",
+    "",
+    "",
+    Cr.NS_ERROR_INVALID_ARG,
+  ],
+  [
+    // broken % escapes
+    "UTF-8''a%b",
+    "",
+    "",
+    Cr.NS_ERROR_INVALID_ARG,
+  ],
+  [
+    // broken % escapes
+    "UTF-8''a%",
+    "",
+    "",
+    Cr.NS_ERROR_INVALID_ARG,
+  ],
+  [
+    // broken UTF-8
+    "UTF-8''%A3%20rates",
+    "",
+    "",
+    0x8050000e /* NS_ERROR_UDEC_ILLEGALINPUT */,
+  ],
+];
+
+function do_tests(whichRFC) {
+  var mhp = Cc["@mozilla.org/network/mime-hdrparam;1"].getService(
+    Ci.nsIMIMEHeaderParam
+  );
+
+  var unused = { value: null };
+
+  for (var i = 0; i < tests.length; ++i) {
+    dump("Testing #" + i + ": " + tests[i] + "\n");
+
+    // check disposition type
+    var expectedDt =
+      tests[i].length == 3 || whichRFC == 0 ? tests[i][1] : tests[i][3];
+
+    try {
+      let result;
+
+      if (whichRFC == 0) {
+        result = mhp.getParameter(tests[i][0], "", "UTF-8", true, unused);
+      } else {
+        result = mhp.getParameterHTTP(tests[i][0], "", "UTF-8", true, unused);
+      }
+
+      Assert.equal(result, expectedDt);
+    } catch (e) {
+      // Tests can also succeed by expecting to fail with given error code
+      if (e.result) {
+        // Allow following tests to run by catching exception from do_check_eq()
+        try {
+          Assert.equal(e.result, expectedDt);
+        } catch (e) {}
+      }
+      continue;
+    }
+
+    // check filename parameter
+    var expectedFn =
+      tests[i].length == 3 || whichRFC == 0 ? tests[i][2] : tests[i][4];
+
+    try {
+      let result;
+
+      if (whichRFC == 0) {
+        result = mhp.getParameter(
+          tests[i][0],
+          "filename",
+          "UTF-8",
+          true,
+          unused
+        );
+      } else {
+        result = mhp.getParameterHTTP(
+          tests[i][0],
+          "filename",
+          "UTF-8",
+          true,
+          unused
+        );
+      }
+
+      Assert.equal(result, expectedFn);
+    } catch (e) {
+      // Tests can also succeed by expecting to fail with given error code
+      if (e.result) {
+        // Allow following tests to run by catching exception from do_check_eq()
+        try {
+          Assert.equal(e.result, expectedFn);
+        } catch (e) {}
+      }
+      continue;
+    }
+  }
+}
+
+function test_decode5987Param() {
+  var mhp = Cc["@mozilla.org/network/mime-hdrparam;1"].getService(
+    Ci.nsIMIMEHeaderParam
+  );
+
+  for (var i = 0; i < rfc5987paramtests.length; ++i) {
+    dump("Testing #" + i + ": " + rfc5987paramtests[i] + "\n");
+
+    var lang = {};
+    try {
+      var decoded = mhp.decodeRFC5987Param(rfc5987paramtests[i][0], lang);
+      if (rfc5987paramtests[i][3] == Cr.NS_OK) {
+        Assert.equal(rfc5987paramtests[i][1], decoded);
+        Assert.equal(rfc5987paramtests[i][2], lang.value);
+      } else {
+        Assert.equal(rfc5987paramtests[i][3], "instead got: " + decoded);
+      }
+    } catch (e) {
+      Assert.equal(rfc5987paramtests[i][3], e.result);
+    }
+  }
+}
+
+function run_test() {
+  // Test RFC 2231 (complete header field values)
+  do_tests(0);
+
+  // Test RFC 5987 (complete header field values)
+  do_tests(1);
+
+  // tests for RFC5987 parameter parsing
+  test_decode5987Param();
+}