XUL Overlays
xul files and xul overlays overlays are xul files used to describe extra content in the ui.
... though overlays often define ui elements that have been added as a result of an update or enhancement of some kind, they can be used in many different ways.
... overlays provide a general mechanism for: adding ui for additional components, as described in the example above overriding small pieces of a xul file without having to resupply the whole ui reusing particular pieces of the ui xul files and overlays work together to describe a single master document.
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Cross Package Overlays - Archive of obsolete content
« previousnext » this section describes how to apply overlays to files that don't import them.
... applying overlays to other packages note: this section talks about contents.rdf which has been replaced in gecko 1.8 by manifest files.
... overlays have another very useful feature.
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DOM Inspector internals - Firefox Developer Tools
.js hooks.js inspector.css inspector.js inspectoroverlay.xul inspector.xml inspector.xul keysetoverlay.xul object.js object.xul popupoverlay.xul sidebar.js sidebar.xul statusbaroverlay.xul tasksoverlay-cz.xul tasksoverlay-ff.xul tasksoverlay-mobile.xul tasksoverlay-sb.xul tasksoverlay-tb.xul tasksoverlay.xul toolboxoverlay.xul utils.js venkmanoverlay.xul viewerregistry.js overlays you will notice that there are a lot of overlays.
... some overlays can be described as host-integration overlays, and others as shared structure overlays.
... host-integration overlays dom inspector is a general-purpose extension, suitable for use with any mozilla toolkit host application.
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Chapter 5: Let's build a Firefox extension - Archive of obsolete content
extension/ chrome manifest chrome/ #registered in the chrome content package #run with privileges locale package skin package figure 1: chrome packages and chrome registration (fixme: not really explicit and not a figure) cross-package overlays the “overlay” technique introduced in chapter 3 required the use of the xul-overlay instruction in the xul document that is the overlay target.
...in fact, you need to use cross-package overlays to append buttons or menus to the firefox browser window.
... normal overlay: adding the xul-overlay instruction to the target xul document overlays it with another xul document cross-package overlay: adding a cross manifest permits one xul file to overlay another without any xul-overlay instruction.
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The Joy of XUL - Archive of obsolete content
overlays overlays are xul files used to describe extra content for the ui.
... overlays are a powerful mechanism for customizing and extending existing applications because they work in two related but highly different ways.
... in one respect, overlays are synonymous with "include" files in other languages because an application may specify that an overlay be included in its definition.
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Bootstrapped extensions - Archive of obsolete content
traditional extensions include overlays, wherein the application can load up xul from the extension's package and automatically apply it on top its own ui.
...these are special extensions that, instead of using overlays to apply their user interface to the application, programmatically insert themselves into the application.
... not all chrome.manifest instructions are supported in bootstrapped add-ons, for example you still cannot register xul overlays from a bootstrapped add-on.
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Making it into a static overlay - Archive of obsolete content
static overlays are added to a xul file via a reference at the top of the file (much like stylesheets and javascript scripts).
... dynamic overlays are added to a xul file via a reference in the chrome registry.
... overlays provide a way to break up a large xul file into several different files (one that describes the overall structure of an application window and the others to implement specific portions of the window) to improve code readability, maintainability, and extensability.
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XUL Migration Guide - Archive of obsolete content
user interface components xul-based add-ons typically implement a user interface using a combination of two techniques: xul overlays and xul windows.
... xul overlays xul overlays are used to modify existing windows such as the main browser window.
... because sdk-based extensions are restartless, they can't use xul overlays.
... my-addon/ chrome/ content/ locale/ skin/ chrome.manifest data/ lib/ package.json there are limitations on what you can do in this manifest file: for example, you can't register overlays, resource: uris, or components.

How to convert an overlay extension to restartless - Archive of obsolete content
well, xul overlays and windows, jsm files, chrome & resource mappings with localization, default preferences, but no xpcom components of your own.
... step 6: no more xul overlays ok, now we're getting into some more drastic changes.
... you won't be able to use your chrome.manifest to load xul overlays anymore with a restartless add-on.
...no resource mappings or chrome overlays.

Extensions support in SeaMonkey 2 - Archive of obsolete content
some urls are listed below: url in firefox url in seamonkey overlays chrome://browser/content/browser.xul chrome://navigator/content/navigator.xul main browser window chrome://browser/content/pageinfo/pageinfo.xul chrome://navigator/content/pageinfo/pageinfo.xul page info window chrome://browser/content/preferences/permissions.xul chrome://communicator/content/permis...onsmanager.xul permis...
...some important menu ids are listed below, menu ids are based on firefox 3 source code: menu id in firefox menu id in seamonkey 1.x and 2.0 seamonkey 2.1 overlays menu_filepopup menu_filepopup menu_filepopup file menu popup menu_editpopup menu_edit_popup menu_editpopup edit menu popup menu_viewpopup menu_view_popup menu_view_popup view menu popup - gopopup gopopup go menu popup placespopup - - history menu po...
...although this doesn't affect the appearance of the display, it may affect your extension if it overlays chrome relative to these elements.
... in manifest file seamonkey uses different overlays than other applications.

SeaMonkey - making custom toolbar (SM ver. 1.x) - Archive of obsolete content
delete these two files: chrome.rdf overlays.rdf explanation: seamonkey automatically rebuilds these files the next time it starts.
... rdf:resource="urn:mozilla:package:custombutton"/> </rdf:seq> <rdf:description rdf:about="urn:mozilla:package:custombutton" chrome:displayname="custom button" chrome:description="my custom toolbar button" chrome:author="my name" chrome:name="custombutton" chrome:localeversion="1.8" chrome:skinversion="1.5" chrome:extension="true"/> <rdf:seq about="urn:mozilla:overlays"> <!-- browser --> <rdf:li> <rdf:seq about="chrome://navigator/content/navigator.xul"> <rdf:li>chrome://custombutton/content/button.xul</rdf:li> </rdf:seq> </rdf:li> <!-- address book --> <rdf:li> <rdf:seq about="chrome://messenger/content/addressbook/addressbook.xul"> <rdf:li>chrome://custombutton/content/button.xul</rdf:li> </rdf:seq...
...uninstalling the button if you ever want to uninstall the button, delete the files chrome.rdf and overlays.rdf again, just as you did in step 2.
...after changing contents.rdf, delete the files chrome.rdf and overlays.rdf so that seamonkey registers the change the next time it starts.

XUL Structure - Archive of obsolete content
however, there are some features that are specific to html, such as forms, and others which are specific to xul, such as overlays.
...registered packages are not required to use overlays, of course.
...likewise, xul specific features such as overlays and templates are only available in xul documents.
... many packages will include a contents.rdf file, which describes the package, its author, and the overlays it uses.

Writing Skinnable XUL and CSS - Archive of obsolete content
css files that are used by xul overlays should never import the global skin (or any other skin for that matter).
...because the button is used in the navigator window (through overlays), the fonts/colors used should not be described by messenger.
...xul overlays, however, should not, since they will be used in the context of other skins.
...examples of overlays that should take place using the chrome registry include the security padlock icon and any messenger ui in the navigator window.

Main Windows
things appear confusing for several reasons: much of the code is written to be portable, so instead of duplicating it, its been put in overlays that are loaded over many different types of windows.
...the rest is loaded from overlays: mailwindowoverlay.xul this is the red sections shown in the interface above (where?), including the toolbars, notification bars, and the status bar, but also includes most of the commands, keysets, and context menus of thunderbird, along with a whole lot of javascript.
...its almost exactly the same as messenger.xul in terms of overlays, but just lacks the folder and threadpanes normally shown.
... menus, toolbar buttons, and headers are all taken from exactly the same overlays listed above though.

The Essentials of an Extension - Archive of obsolete content
xul files usually define one of two things: windows or overlays.
...you can declare overlays for any window or dialog in firefox, but overlaying the main browser window is the most common case by far.
...if we used generic ids like container or input, they will likely conflict with ids used within firefox, or with ids from other extension overlays.