error report window popped up when upgrading the FF version

[gaurish.kdm]

FLAGFOX VERSION: 4.1.x (missing IPDB!)

ERROR MESSAGE: Fatal Flagfox startup error!

EXCEPTION THROWN: TypeError: addon is null

STACK TRACE:
(null)@resource://flagfox/flagfox.jsm:70
safeCall((function (addon) {try {FlagfoxVersion = addon.version;var ip4db = addon.getResourceURI(IPv4DBfilename).QueryInterface(Components.interfaces.nsIFileURL).file;var ip6db = addon.getResourceURI(IPv6DBfilename).QueryInterface(Components.interfaces.nsIFileURL).file;ipdb.init(ip4db, ip6db);checkIPDBage();ready = true;} catch (e) {handleStartupError(e);}}),null)@resource://gre/modules/AddonManager.jsm:50
([object Object])@resource://gre/modules/AddonManager.jsm:888
AOC_callNext()@resource://gre/modules/AddonManager.jsm:120
(null)@resource://gre/modules/AddonManager.jsm:883
PL_getAddon("{1018e4d6-728f-4b20-ad56-37578a4de76b}",(function (aAddon) {"use strict";if (aAddon) {safeCall(aCallback, aAddon);} else {aCaller.callNext();}}))@resource:///modules/PluginProvider.jsm:81
callProvider([object Object],"getAddonByID",null,"{1018e4d6-728f-4b20-ad56-37578a4de76b}",(function (aAddon) {"use strict";if (aAddon) {safeCall(aCallback, aAddon);} else {aCaller.callNext();}}))@resource://gre/modules/AddonManager.jsm:78
([object Object],[object Object])@resource://gre/modules/AddonManager.jsm:879
AOC_callNext()@resource://gre/modules/AddonManager.jsm:126
(null)@resource://gre/modules/AddonManager.jsm:883
(null)@resource:///modules/XPIProvider.jsm:3078
([object Array])@resource:///modules/XPIProvider.jsm:4919
(0)@resource:///modules/XPIProvider.jsm:3905

BROWSER: Mozilla Firefox 8.0 (Gecko 8.0 / 20111104165243)
OS: Windows NT 6.1; WOW64 (WINNT x86-msvc windows)
LOCALE: en-us content / en-us UI / en-us OS

[Boudica]

I do not know what steps to take in dealing with the problem, however I will try to find an answer. First time that this has ever occurred when updating with the Firefox browser.

The following is the report which popped up while I was attempting to allow the updated version to install:
*****************************************************************************

Sorry, the Flagfox extension has encountered a problem. The following error output and a Flagfox preferences dump has been sent to Tools -> Error Console.

------------------------------------------------------------
FLAGFOX VERSION: 4.1.x (missing IPDB!)

ERROR MESSAGE: Fatal Flagfox startup error!

EXCEPTION THROWN: TypeError: addon is null

STACK TRACE:
(null)@resource://flagfox/flagfox.jsm:70
safeCall((function (addon) {try {FlagfoxVersion = addon.version;var ip4db = addon.getResourceURI(IPv4DBfilename).QueryInterface(Components.interfaces.nsIFileURL).file;var ip6db = addon.getResourceURI(IPv6DBfilename).QueryInterface(Components.interfaces.nsIFileURL).file;ipdb.init(ip4db, ip6db);checkIPDBage();ready = true;} catch (e) {handleStartupError(e);}}),null)@resource://gre/modules/AddonManager.jsm:50
([object Object])@resource://gre/modules/AddonManager.jsm:888
AOC_callNext()@resource://gre/modules/AddonManager.jsm:120
(null)@resource://gre/modules/AddonManager.jsm:883
PL_getAddon("{1018e4d6-728f-4b20-ad56-37578a4de76b}",(function (aAddon) {"use strict";if (aAddon) {safeCall(aCallback, aAddon);} else {aCaller.callNext();}}))@resource:///modules/PluginProvider.jsm:81
callProvider([object Object],"getAddonByID",null,"{1018e4d6-728f-4b20-ad56-37578a4de76b}",(function (aAddon) {"use strict";if (aAddon) {safeCall(aCallback, aAddon);} else {aCaller.callNext();}}))@resource://gre/modules/AddonManager.jsm:78
([object Object],[object Object])@resource://gre/modules/AddonManager.jsm:879
AOC_callNext()@resource://gre/modules/AddonManager.jsm:126
(null)@resource://gre/modules/AddonManager.jsm:883
(null)@resource:///modules/XPIProvider.jsm:3078
([object Array])@resource:///modules/XPIProvider.jsm:4919
(0)@resource:///modules/XPIProvider.jsm:3905

BROWSER: Mozilla Firefox 8.0 (Gecko 8.0 / 20111104165243)
OS: Windows NT 5.1 (WINNT x86-msvc windows)
LOCALE: en-us content / en-us UI / en-us OS

[DaveG]

This is a bug in Firefox's Addon Manager that occurs for a few people when they do a major Firefox update. Please reinstall Flagfox (uninstall Flagfox, restart Firefox, then install Flagfox again) to fix the problem.

[Boudica]

Thank you, DaveG! I already "somehow" navigated the hurdles, and was able to get all of the extensions which were available. Unfortunately there were a lot of extensions (or add-ons) which are not compatible with Version 8. Do not understand the reasons for this, however will just have to live with it. Thank you once again for posting the advice. Your help is most sincerely appreciated.