Rated 5 out of 5 stars

This fine add on need a patch to work with actual TB:

diff -Nur marksubfolders-1.0.2/chrome/content/markAllReadSubfolders.js marksubfolders-1.0.3/chrome/content/markAllReadSubfolders.js
--- marksubfolders-1.0.2/chrome/content/markAllReadSubfolders.js 2010-06-07 01:36:40.000000000 +0200
+++ marksubfolders-1.0.3/chrome/content/markAllReadSubfolders.js 2014-10-14 19:16:13.573989008 +0200
@@ -129,7 +129,13 @@
{
var version = Components.classes["@mozilla.org/xre/app-info;1"].
getService(Components.interfaces.nsIXULAppInfo).version;
- var appVer3Orlater = version.substring(0,2) == "3.";
+
+ var consoleService = Components.classes["@mozilla.org/consoleservice;1"].
+ getService(Components.interfaces.nsIConsoleService);
+
+ var mainVer = version.split(".");
+ var appVer3Orlater = mainVer[0] >= 3;
+ consoleService.logStringMessage("MarkSubfolders: Version=" + version + " mainVer:"+mainVer+" appVer3Orlater:"+appVer3Orlater );

// for backword compatibility
if (appVer3Orlater) {
@@ -162,3 +168,5 @@
// a) Support Thunderbird3.0beta4, and rewrite code.
// 1.0.2 2010/06/05
// Support Thunderbird 3.1 and rewrite code.
+// 1.0.3 2014/10/14
+// Support Thunderbird > 3.0
diff -Nur marksubfolders-1.0.2/chrome/locale/de/markallreadsub_description.properties marksubfolders-1.0.3/chrome/locale/de/markallreadsub_description.properties
--- marksubfolders-1.0.2/chrome/locale/de/markallreadsub_description.properties 2010-01-01 16:20:24.000000000 +0100
+++ marksubfolders-1.0.3/chrome/locale/de/markallreadsub_description.properties 2014-10-14 18:36:50.602260298 +0200
@@ -1 +1 @@
-extensions.markallreadsub@thunderbird.extension.description = Das Menü 'Unterordner als gelesen markieren', fügte in dem Ordner-Kontextmenü.
+extensions.markallreadsub@thunderbird.extension.description = Das Menü 'Unterordner als gelesen markieren', im Ordner-Kontextmenü.
diff -Nur marksubfolders-1.0.2/install.rdf marksubfolders-1.0.3/install.rdf
--- marksubfolders-1.0.2/install.rdf 2010-06-06 23:47:58.000000000 +0200
+++ marksubfolders-1.0.3/install.rdf 2014-10-14 19:15:15.721787497 +0200
@@ -5,7 +5,7 @@

<Description about="urn:mozilla:install-manifest">
<em:id>markallreadsub@thunderbird.extension</em:id>
- <em:version>1.0.2</em:version>
+ <em:version>1.0.3</em:version>
<em:type>2</em:type>

<!-- Target Application this extension can install into,
@@ -14,7 +14,7 @@
<Description>
<em:id>{3550f703-e582-4d05-9a08-453d09bdfdc6}</em:id>
<em:minVersion>1.5</em:minVersion>
- <em:maxVersion>3.2a1pre</em:maxVersion>
+ <em:maxVersion>31.*</em:maxVersion>
</Description>
</em:targetApplication>