Index: chrome/chromeFiles/content/browser.js
===================================================================
RCS file: /cvs/greasemonkey/src/chrome/chromeFiles/content/browser.js,v
retrieving revision 1.5
diff -U4 -r1.5 browser.js
--- chrome/chromeFiles/content/browser.js	9 Jan 2006 10:07:55 -0000	1.5
+++ chrome/chromeFiles/content/browser.js	10 Feb 2006 13:27:10 -0000
@@ -69,8 +69,9 @@
     "DOMContentLoaded", this.handleContentLoad, false);
 
   // listen for clicks on the install bar
   this.obsSvc.addObserver(this, "install-userscript", false);
+  this.obsSvc.addObserver(this, "view-source", false);
 
   // update enabled icon
   this.refreshStatus();
 }
@@ -81,8 +82,9 @@
  */
 GM_BrowserUI.prototype.handleWinUnload = function(e) {
   // remove install bar obsrever
   this.obsSvc.removeObserver(this, "install-userscript");
+  this.obsSvc.removeObserver(this, "view-script");
 
   GM_prefRoot.unwatch("enabled", this.refreshStatus);
 }
 
@@ -100,26 +102,40 @@
   
   for(var i = 0; i < 6; i++){
     this.greetz.push(this.bundle.getString('greetz.' + i));
   }
-  if (GM_getEnabled() && win.location.pathname.match(/\.user\.js$/i)) {
+  if (GM_getEnabled() && win.location.pathname.match(/\.user\.js$/i) && win.location.protocol != "view-source:")) {
     // find the browser the user script is loading in
     for (var i = 0, browser; browser = this.tabBrowser.browsers[i]; i++) {
       if (browser.contentWindow == win) {
         var pick = Math.round(Math.random() * (this.greetz.length - 1));
         var greeting = this.greetz[pick];
 
-        this.tabBrowser.showMessage(
-          browser,
-          "chrome://greasemonkey/content/status_on.gif",
-          greeting + " " + this.bundle.getString('greeting.msg'),
-          this.bundle.getString('greeting.btn'),
-          null /* default doc shell */,
-          "install-userscript",
-          null /* no popuup */,
-          "top",
-          true /* show close button */,
-          "I" /* access key */);
+        if (win.document.contentType.match(/^(text\/plain|application\/(x-)?javascript)$/)) {
+          this.tabBrowser.showMessage(
+            browser,
+            "chrome://greasemonkey/content/status_on.gif",
+            greeting + " " + this.bundle.getString('greeting.msg'),
+            this.bundle.getString('greeting.btn'),
+            null /* default doc shell */,
+            "install-userscript",
+            null /* no popuup */,
+            "top",
+            true /* show close button */,
+            "I" /* access key */);
+        } else {
+          this.tabBrowser.showMessage(
+            browser,
+            "chrome://greasemonkey/content/status_off.gif",
+            greeting + " " + this.bundle.getString('warning.msg'),
+            this.bundle.getString('warning.btn'),
+            null /* default doc shell */,
+            "view-source",
+            null /* no popup */,
+            "top",
+            true /* show close button */,
+            null /* access key */);
+        }
 
         break;
       }
     }
@@ -196,8 +212,13 @@
     if (this.win == this.winWat.activeWindow) {
       new ScriptDownloader(this).installFromURL(
         this.tabBrowser.selectedBrowser.contentWindow.location.href);
     }
+  } else if (topic == "view-source") {
+    if (this.win == this.winWat.activeWindow) {
+      this.tabBrowser.selectedBrowser.contentWindow.location.replace("view-source:"
+        + this.tabBrowser.selectedBrowser.contentWindow.location.href);
+    }
   } else {
     throw new Error("Unexpected topic received: {" + topic + "}");
   }
 }
Index: chrome/chromeFiles/locale/en-US/gm-browser.properties
===================================================================
RCS file: /cvs/greasemonkey/src/chrome/chromeFiles/locale/en-US/gm-browser.properties,v
retrieving revision 1.1
diff -U4 -r1.1 gm-browser.properties
--- chrome/chromeFiles/locale/en-US/gm-browser.properties	5 Jan 2006 13:22:57 -0000	1.1
+++ chrome/chromeFiles/locale/en-US/gm-browser.properties	10 Feb 2006 13:27:11 -0000
@@ -6,8 +6,10 @@
 tooltip.enabled=Greasemonkey is enabled.
 
 greeting.msg=This is a Greasemonkey User Script. Click Install to start using it.
 greeting.btn=Install
+warning.msg=This User Script is not plain text so it cannot be installed.
+warning.btn=View Source
 
 greetz.0=Huzzah! 
 greetz.1=Toodles... 
 greetz.2=Howdy!