The above Extensions and Themes example buttons doesn't work on Bon Echo.
These are the replacements, work on Firefox 1.5 and Bon Echo. Not sure with Minefield.
Middle click on the button will open the Extensions/Themes window in a new tab.
- <a href="custombutton://Extensions%5D%5Bdata%3Aimage/png%3Bbase64%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%3D%5D%5Bvar%20appInfo%20%3D%20Components.classes%5B%22@mozilla.org/xre/app-info%3B1%22%5D%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20.getService%28Components.interfaces.nsIXULAppInfo%29%3B%0Avar%20versionChecker%20%3D%20Components.classes%5B%22@mozilla.org/xpcom/version-comparator%3B1%22%5D%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20.getService%28Components.interfaces.nsIVersionComparator%29%3B%0Aif%28versionChecker.compare%28appInfo.version%2C%20%222.0a%22%29%20%3E%3D%200%29%20%0A%20%20BrowserOpenAddonsMgr%28%29%3B%0Aelse%20BrowserOpenExtensions%28%27extensions%27%29%3B%0A%0A%5D%5Bthis.setAttribute%28%22onclick%22%2C%20%22if%28event.button%20%3D%3D%201%29%20gBrowser.selectedTab%20%3D%20gBrowser.addTab%28%27chrome%3A//mozapps/content/extensions/extensions.xul%3Ftype%3Dextensions%27%29%22%29%3B">Extensions</a>
- <a href="custombutton://Themes%5D%5Bdata%3Aimage/png%3Bbase64%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%3D%3D%5D%5Bvar%20appInfo%20%3D%20Components.classes%5B%22@mozilla.org/xre/app-info%3B1%22%5D%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20.getService%28Components.interfaces.nsIXULAppInfo%29%3B%0Avar%20versionChecker%20%3D%20Components.classes%5B%22@mozilla.org/xpcom/version-comparator%3B1%22%5D%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20.getService%28Components.interfaces.nsIVersionComparator%29%3B%0Aif%28versionChecker.compare%28appInfo.version%2C%20%222.0a%22%29%20%3E%3D%200%29%20%0A%20%20BrowserOpenAddonsMgr%28%29%3B%0Aelse%20BrowserOpenExtensions%28%27themes%27%29%3B%0A%0A%5D%5Bthis.setAttribute%28%22onclick%22%2C%20%22if%28event.button%20%3D%3D%201%29%20gBrowser.selectedTab%20%3D%20gBrowser.addTab%28%27chrome%3A//mozapps/content/extensions/extensions.xul%3Ftype%3Dthemes%27%29%22%29%3B%0A">Themes</a>
Plus: <a href="custombutton://Add%20New%20Button%5D%5Bdata%3Aimage/png%3Bbase64%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%3D%3D%5D%5BopenDialog%28%22chrome%3A//custombuttons/content/edit.xul%22%2C%20%22%22%2C%20%22chrome%2Cresizable%2Cdialog%3Dno%2Cmodal%3Dno%22%2C%20null%29%3B%5D%5B">Add New Button</a>
Other: userChrome.js script to <a href="data:application/x-javascript;base64,KGZ1bmN0aW9uKCkgew0KICBldmFsKCJjdXN0b21idXR0b25zLmFkZEJ1dHRvbiA9ICIgKyBjdXN0b21idXR0b25zLmFkZEJ1dHRvbi50b1N0cmluZygpCiAgICAucmVwbGFjZSgvY3VzdG9tYnV0dG9uc1wtZWRpdC8sICIiKQogICAgLnJlcGxhY2UoL1wsZGVwZW5kZW50LywgIiIpCiAgICAucmVwbGFjZSgvXD1uby8sICI9bm8sbW9kYWw9bm8iKQogICk7CgogIGV2YWwoImN1c3RvbWJ1dHRvbnMuZWRpdEJ1dHRvbiA9ICIgKyBjdXN0b21idXR0b25zLmFkZEJ1dHRvbi50b1N0cmluZygpCiAgICAucmVwbGFjZSgvbnVsbC8sICJkb2N1bWVudC5wb3B1cE5vZGUiKQogICk7Cgp9KSgpOw0KDQo=">enable you to open more than one CB editor window</a>