This article provides helpful information to extension developers trying to update their extensions to work properly in Firefox 3.6.
User interface changes
Right-clicking on elements (including links and images) no longer offers a "Properties" menu item. The properties dialog box was not useful for most users and has been removed. If your extension interacts with that menu item in any way, you'll need to revise your code to add it yourself, or contribute your own context menu entry directly.
Add-on package changes
In order to allow add-ons' icons to be displayed even when they're disabled, Gecko 1.9.2 added support for automatically detecting and using an icon named
icon.png, located in the add-on's root directory. This is used if the add-on is disabled, or if the manifest is missing an
HTML 5 compliance improvements
The DOM Level 2 views to HTML and XHTML documents are now unified per HTML 5.
localNameDOM property now returns the name of HTML element nodes in lower case. Previously, in HTML documents, it returned it in upper case. (DOM Level 1
tagNamecontinues to return in upper case in HTML documents.)
namespaceURIDOM property now returns
"http://www.w3.org/1999/xhtml"on HTML element nodes. Previously, in HTML documents, it returned
document.createElementNS(null, "FOO")no longer creates an HTML element node in HTML documents.
document.createElementNS("http://www.w3.org/1999/xhtml", "foo")continue to work in HTML documents.
local-namefunctions in XPath returns the name of HTML elements in lower case. Previously, in HTML documents, they returned it in upper case.
The most probable upgrade problem is the pattern
if (elt.localName == "FOO").
Example: Testing if an element is an HTML img element
Firefox 3.6, both text/html and application/xhtml+xml
if (elt.localName == "img" && elt.namespaceURI == "http://www.w3.org/1999/xhtml")
Firefox 3.5 and 3.6, only extension-supplied text/html without foreign (e.g. SVG) script-inserted elements
if (elt.tagName == "IMG")
Firefox 3.5 and 3.6, both text/html and application/xhtml+xml
if (elt instanceof HTMLImageElement)
contents.rdf no longer supported
Support for the obsolete
contents.rdf method for registering chrome has been removed in Gecko 1.9.2, and is no longer supported by Firefox 3.6. This means that add-ons that use contents.rdf can no longer be installed.
Make sure you include a chrome.manifest in your XPI.