Events have Status as "Default" or "OK" are ready for use.
The "Freak" ones do fire, but fire at strange timing so they are not friendly for use.
And the "Test" and "Unsure" label events I've never captured successully... so (developers) don't bother unless you like to test.

Noise-Specific events don't exist in original Firefox, you can't capture them without Noise.

Events were split into 4 tables by type： Event topic, Browser event, Window event, and Browser/Window event.

Table 1. event type: Event topic (via addObserver)

Name	Event String	Status	Summary
Findbar wrapped	noise-TypeAheadFind.FIND_WRAPPED	Default	Noise-Specific.
Toggle sidebar	noise-toggleSidebar	Default	Noise-Specific.
Alert notificationbox	noise-alert-loaded	Default	Noise-Specific; Include download finished, new update found, and others which use alert box slide from the bottom-right area of browser.
Start navigation	noise-WebProgress-start	Default	Noise-Specific; Fires when starting navigation on every page.
Stop navigation	noise-WebProgress-stop	OK	Noise-Specific; Fires when stopping of navigation (completion of a request.)
Change location	noise-WebProgress-locationChange	Default	Noise-Specific; Also fires when changing selected tab.
Download started	noise-dl.add	Default	Noise-Specific; Firefox 26 (and above) only.
Download removed	noise-dl.remove	Default	Noise-Specific; Firefox 26 (and above) only.
Download stopped	noise-dl.stop	OK	Noise-Specific; Firefox 26 (and above) only.
Download failed	noise-dl.error	Default	Noise-Specific; Firefox 26 (and above) only.
Session restored	sessionstore-windows-restored	Default	Fires when Firefox starting.
Clear session history	browser:purge-session-history	Default
Clear cache	cacheservice:empty-cache	Default
Open window	toplevel-window-ready	Default	All windows include dialogs, fire this.
Close window	domwindowclosed	Default	Same as above.
Download started	dl-start	Default
Download failed	dl-failed	Default
Download canceled	dl-cancel	Default
Download done	dl-done	Default	May clash with "Alert notificationbox" sound (one would be aborted by another.)
Site permission changed	perm-changed	Default	For example, block a site from loading images.
Xpinstall install blocked	xpinstall-install-blocked	Default	For example, extension not compatible with Firefox version.
Noise log new	noise-log	Default	When useing Noise.log() function of Noise.
Remove download item	download-manager-remove-download	OK	Also fires when a download finish. remove from Default since 1.0b4
Extension manager actions	em-action-requested	OK	Actions such as enable, install, etc. See Observer Notifications
Change search engine	browser-search-engine-modified	OK
Flush chrome cache	chrome-flush-caches	OK
Charset menu	charsetmenu-selected	OK
Open window	browser-window-before-show	OK	Similar as toplevel-window-ready
Window opened	domwindowopened	OK	Same as above.
View page info new3.5	page-info-dialog-loaded	OK
Password form found new3.5	passwordmgr-found-form	OK	See Observer Notifications - Login Manager
http modify request	http-on-modify-request	OK	OK, But fires too frequently...
http examine response	http-on-examine-response	OK	OK, But same as above.
cookie changed	cookie-changed	OK
cookie changed	cookie-rejected	OK
Private browsing	private-browsing	OK	OK, But sound may abort due to Firefox auto restart.
Private browsing (vote)	private-browsing-cancel-vote	OK	Ask for entering/exiting private browsing mode. Fires before every try of toggling the mode.
Offline requset new	offline-requested	OK	To enter offline mode.
Quit application	quit-application	OK	OK, But sound may abort when quit.
Quit application	quit-application-requested	OK	OK, But same as above.
Quit application (granted)	quit-application-granted	OK	OK, But same as above. This fires when restarting Firefox.
？？？	nsWebBrowserFind_FindAgain	Freak	Fires when "view source code".
？？？	xpinstall-download-started	Freak	Fires when installing xpi from desktop.
？？？	dom-window-destroyed	Freak	Repeatly fires at application start...
？？？	a11y-init-or-shutdown	Test
？？？	xul-overlay-parsererror	Test
？？？	accessible-event	Test
？？？	chrome-flush-skin-caches	Test
？？？	network:offline-about-to-go-offline	Test
？？？	network:offline-status-changed	Test
？？？	memory-pressure	Unsure
？？？	plugins-list-updated	Unsure
？？？	xpcom-shutdown	Unsure
？？？	xpcom-autoregistration	Unsure
？？？	signonChanged	Unsure
？？？	prefservice:before-reset	Unsure
？？？	prefservice:before-read-userprefs	Unsure
？？？	refresh-blocked	Unsure
？？？	final-ui-startup	Unsure
？？？	earlyformsubmit	Unsure
？？？	signonSelectUser	Unsure
？？？	TabMove	Unsure
？？？	app-startup	Unsure
？？？	download-starting	Unsure
？？？	xpcom-startup	Unsure
？？？	agent-sheet-added	Unsure
？？？	user-sheet-added	Unsure
？？？	agent-sheet-removed	Unsure
？？？	user-sheet-removed	Unsure
FoxAge2ch message	foxage2ch-show-message	OK	See TOPIC_SHOW_MESSAGE in chrome://foxage2ch/content/foxage2ch.js
FoxAge2ch tree rebuild	foxage2ch-rebuild-tree	OK	Same as above, TOPIC_REBUILD_TREE
FoxAge2ch global	foxage2ch-global	OK	Same as above, TOPIC_GLOBAL
LastTab TabList ItemActive	LastTab.TabList.ItemActive	OK	Fires when mouse moving hover on a tablist item, see chrome://lasttab/content/lasttab.browser.js
LastTab TabList ItemInactive	LastTab.TabList.ItemInactive	OK	Fires when mouse moving out of a tablist item.

Table 2. event type: Browser event (via gBrowser.addEventListener)

Name	Event String	Status	Summary
Popup Blocked	DOMPopupBlocked	Default
Plugin not found	PluginNotFound	Default
Command	command	OK
？？？	DOMUpdatePageReport	Freak	Fires when closing a page.
？？？	ValueChange	Freak
？？？	NewPluginInstalled	Test
？？？	PluginBlocklisted	Unsure
？？？	AppCommand	Unsure
？？？	NewTab	Unsure

Table 3. event type: Window event (via window.addEventListener)

Name	Event String	Status	Summary
Toggle fullscreen	fullscreen	Default
Before unload	beforeunload	OK	Fires before a window close.
Open modal dialog	DOMWillOpenModalDialog	OK	For example, open Firefox preference window.
Window closed	DOMWindowClose	OK	Has some differences from domwindowclosed.
Focus	focus	OK
MenuItem active	DOMMenuItemActive	OK	Fires when a menu or menuitem is hovered over or highlighted.
MenuItem inactive	DOMMenuItemInactive	OK	Fires when a menu or menuitem is hovered out or lost from highlighted.
？？？	DOMModalDialogClosed	Unsure
？？？	PopupWindow	Unsure
Online updated	online	OK
Offline updated	offline	OK
Text input updated	textInput	Unsure	Same as keypress, but not supported.

Table 4. event type: Browser event (via gBrowser.addEventListener) or Window event (via window.addEventListener)

Name	Event String	Status	Summary
Open tab	TabOpen	Default
Close tab	TabClose	Default
Popup Blocked	DOMPopupBlocked	Default
Information bar alert updated	AlertActive	Default	Include remember password, popup blocked, plugin not found, etc.
Copy	copy	OK
Cut	cut	OK
Paste	paste	OK
Change	change	OK	Fires when losing focus if a field value changed.
Checkbox toggled	CheckboxStateChange	OK
radio button toggled	RadioStateChange	OK
Form submit	submit	OK
Form reset	reset	OK
Click	click	OK	Included middle and right clicks.
Double click	dblclick	OK	Included double right click.
Keydown	keydown	OK
Keypress	keypress	OK	Not include keys such as Ctrl, Alt, and so on.
Keyup	keyup	OK
Mousedown	mousedown	OK
Mousemove	mousemove	OK
Mouseout	mouseout	OK
Mouseover	mouseover	OK
Mouseup	mouseup	OK
Drag gesture	draggesture	OK
Window resize	resize	OK	Not include minimize/maximize window. Set event type to browser/window seems a little direffent.
Overflow	overflow	OK	Content larger than display space.
Underflow	underflow	OK	Content not larger than display space.
Scroll roll	scroll	OK
？？？	blur	Test
Context menu	contextmenu	Freak	Fires when right clicking some place (ex: status bar).
Show page	pageshow	OK
Content loaded	DOMContentLoaded	OK
Frame content loaded	DOMFrameContentLoaded	OK	If set event type to 'window', this also fires when normal content loaded.
Page title changed	DOMTitleChanged	OK	Fires when setting page title (include reloads.) If event type is 3, this also happens when switching between tabs.
Mouse scrolled	DOMMouseScroll	OK
？？？	DOMSubtreeModified	Freak
？？？	DOMNodeInserted	Freak
Link element added	DOMLinkAdded	OK
？？？	DOMLinkRemoved	Unsure
？？？	DOMNodeRemoved	Unsure
？？？	DOMNodeRemovedFromDocument	Unsure
？？？	DOMNodeInsertedIntoDocument	Unsure
Attribute modified	DOMAttrModified	OK	Captures in more cases when event type is set to 'window'.
？？？	DOMCharacterDataModified	Unsure
？？？	DOMElementNameChanged	Unsure
？？？	DOMAttributeNameChanged	Unsure
？？？	DOMActivate	Unsure
Focus in	DOMFocusIn	Unsure	Not supported
Focus out	DOMFocusOut	Unsure	Not supported
？？？	windowZLevel	Unsure

• DOM Events - MDC
• Gecko-Specific DOM Events - MDC
• DOM events - Wikipedia
• Observer Notifications - MDC
• Developer Guide - Global Notifications - XULPlanet
• Document Object Model Events - Complete list of event types - W3C
• window - MDC
• DOM:element - MDC