The InfoLister add-on available through the official Mozilla Add-ons Repository does not support Firefox 4. There is a Beta version which supports Firefox 4 on the developers site. However, starting with Firefox 3.6, Mozilla built in most of the functionality of this extension right into Firefox. In the address bar type about:support and press enter. You now have a complete report about your Firefox including, what version/build, installed add-ons as well as about:config customizations. Another nice feature that I keep forgetting about is a button to open your profile folder. There is even a button to copy the report to the clipboard. Here are the details about the Firefox 4.2a1pre 64-Bit Nightly Build I am running:

Application Basics

Name	Firefox
Version	4.2a1pre
User Agent	Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:2.2a1pre) Gecko/20110329 Firefox/4.2a1pre
Profile Directory	Open Containing Folder
Enabled Plugins	about:plugins
Build Configuration	about:buildconfig

Extensions

Name	Version	Enabled	ID
ChromEdit Plus	2.9.0	true	chromeditplus@webdesigns.ms11.net
Photobucket Uploader	1.3	true	pbupload@photobucket.com
OpenDownload	1.0.0	true	{F0B6E3F9-ECD1-40b6-A25F-5C3FF68FB079}
CoLT	2.5.1	true	{e6c4c3ef-3d4d-42d6-8283-8da73c53a283}
PDF Download	3.0.0.2	true	{37E4D8EA-8BDA-4831-8EA1-89053939A250}
SearchLoad Options	0.6.3	true	searchloadoptions@esteban.torres
Pixlr Grabber	2.1.1	true	{d47a9f51-8281-43fa-f450-f28ef8735e9a}
Download Statusbar	0.9.8	true	{D4DD63FA-01E4-46a7-B6B1-EDAB7D6AD389}
Test Pilot	1.1	true	testpilot@labs.mozilla.com
bug582139(Allow bookmarks button in the nav bar)	1.4	true	bug582139@alice0775
Nightly Tester Tools	3.1.2	true	{8620c15f-30dc-4dba-a131-7c5d20cf4a29}
Domain Details	2.6.9	true	{152455DE-7B40-4bcf-B5B4-C68A1BE85A91}
Brief	1.5.3	true	brief@mozdev.org
Greasemonkey	0.9.1	true	{e4a8a97b-f2ed-450b-b12d-ee082ba24781}
Rotate Image	0.1.3.2	true	rotateimage@minisystems.de
Adblock Plus Pop-up Addon	0.2.2	true	adblockpopups@jessehakanen.net
Adblock Plus	1.3.5	true	{d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}

Modified Preferences

Name	Value
accessibility.typeaheadfind.flashBar	0
browser.places.smartBookmarksVersion	2
browser.startup.homepage	http://my.yahoo.com/
browser.startup.homepage_override.buildID	20110329030205
browser.startup.homepage_override.mstone	rv:2.2a1pre
extensions.checkCompatibility	false
extensions.checkCompatibility.3.6	false
extensions.checkCompatibility.3.6b	false
extensions.checkCompatibility.3.6p	false
extensions.checkCompatibility.3.6pre	false
extensions.checkCompatibility.3.7a	false
extensions.checkCompatibility.4.0	false
extensions.checkCompatibility.4.0b	false
extensions.checkCompatibility.4.0p	false
extensions.checkCompatibility.4.0pre	false
extensions.checkCompatibility.4.2a	false
extensions.checkCompatibility.4.2a1	false
extensions.checkCompatibility.4.2a1pre	false
extensions.lastAppVersion	4.2a1pre
network.cookie.prefsMigrated	true
places.database.lastMaintenance	1301694343
places.history.expiration.transient_current_max_pages	249619
print.print_printer	HP LaserJet P1006
print.printer_HP_LaserJet_P1006.print_bgcolor	false
print.printer_HP_LaserJet_P1006.print_bgimages	false
print.printer_HP_LaserJet_P1006.print_command
print.printer_HP_LaserJet_P1006.print_downloadfonts	false
print.printer_HP_LaserJet_P1006.print_edge_bottom	0
print.printer_HP_LaserJet_P1006.print_edge_left	0
print.printer_HP_LaserJet_P1006.print_edge_right	0
print.printer_HP_LaserJet_P1006.print_edge_top	0
print.printer_HP_LaserJet_P1006.print_evenpages	true
print.printer_HP_LaserJet_P1006.print_footercenter
print.printer_HP_LaserJet_P1006.print_footerleft	&PT
print.printer_HP_LaserJet_P1006.print_footerright	&D
print.printer_HP_LaserJet_P1006.print_headercenter
print.printer_HP_LaserJet_P1006.print_headerleft	&T
print.printer_HP_LaserJet_P1006.print_headerright	&U
print.printer_HP_LaserJet_P1006.print_in_color	true
print.printer_HP_LaserJet_P1006.print_margin_bottom	0.5
print.printer_HP_LaserJet_P1006.print_margin_left	0.5
print.printer_HP_LaserJet_P1006.print_margin_right	0.5
print.printer_HP_LaserJet_P1006.print_margin_top	0.5
print.printer_HP_LaserJet_P1006.print_oddpages	true
print.printer_HP_LaserJet_P1006.print_orientation	0
print.printer_HP_LaserJet_P1006.print_page_delay	50
print.printer_HP_LaserJet_P1006.print_paper_data	1
print.printer_HP_LaserJet_P1006.print_paper_height	11.00
print.printer_HP_LaserJet_P1006.print_paper_size_type	0
print.printer_HP_LaserJet_P1006.print_paper_size_unit	0
print.printer_HP_LaserJet_P1006.print_paper_width	8.50
print.printer_HP_LaserJet_P1006.print_reversed	false
print.printer_HP_LaserJet_P1006.print_scaling	1.00
print.printer_HP_LaserJet_P1006.print_shrink_to_fit	true
print.printer_HP_LaserJet_P1006.print_to_file	false
print.printer_HP_LaserJet_P1006.print_unwriteable_margin_bottom	0
print.printer_HP_LaserJet_P1006.print_unwriteable_margin_left	0
print.printer_HP_LaserJet_P1006.print_unwriteable_margin_right	0
print.printer_HP_LaserJet_P1006.print_unwriteable_margin_top	0
privacy.sanitize.migrateFx3Prefs	true
security.warn_viewing_mixed	false

Graphics

Adapter Description	ATI Radeon HD 4250
Vendor ID	1002
Device ID	9715
Adapter RAM	256
Adapter Drivers	aticfx64 aticfx64 aticfx32 aticfx32 atiumd64 atidxx64 atiumdag atidxx32 atiumdva atiumd6a atitmm64
Driver Version	8.821.0.0
Driver Date	1-26-2011
Direct2D Enabled	true
DirectWrite Enabled	true (6.1.7601.17563, font cache 1.80 MB)
WebGL Renderer	(WebGL unavailable)
GPU Accelerated Windows	1/1 Direct3D 10