You can't 'correct' problems, developers would have to do that.
But you can hide them:
firefox >/dev/null 2>&1 &
Enjoy...   :)
ET 


joe@actionline.com writes: 

> What can I do correct the following problems: 
> 
> (1) When I launch: firefox file.htm
> from the command line, I see the following error messages: 
> 
> (firefox:13605): GLib-GObject-CRITICAL **: g_object_unref: assertion
> 'object->ref_count > 0' failed 
> 
> (firefox:13605): GLib-GObject-CRITICAL **: g_object_unref: assertion
> 'object->ref_count > 0' failed
> Fontconfig warning: "/etc/fonts/conf.d/50-user.conf", line 14: reading
> configurations from ~/.fonts.conf is deprecated. please move it to
> /home/joe/.config/fontconfig/fonts.conf manually
> Fontconfig warning: "/etc/fonts/conf.d/50-user.conf", line 14: reading
> configurations from ~/.fonts.conf is deprecated. please move it to
> /home/joe/.config/fontconfig/fonts.conf manually 
> 
> (/usr/lib/firefox/plugin-container:13653): GLib-GObject-CRITICAL **:
> g_object_unref: assertion 'object->ref_count > 0' failed 
> 
> (/usr/lib/firefox/plugin-container:13653): GLib-GObject-CRITICAL **:
> g_object_unref: assertion 'object->ref_count > 0' failed 
> 
> ============ 
> 
> (2) Then when I exit a file launched that way, I see more error messages: 
> 
> 1489787109479   addons.xpi      WARN    Exception running bootstrap
> method shutdown on aushelper@mozilla.org: [Exception... "Component
> returned failure code: 0x80004005 (NS_ERROR_FAILURE)
> [nsIObserverService.removeObserver]"  nsresult: "0x80004005
> (NS_ERROR_FAILURE)"  location: "JS frame ::
> resource://gre/modules/addons/XPIProvider.jsm ->
> jar:file:///home/joe/.mozilla/firefox/mwad0hks.default/features/%7B32b4a072-a8bb-4c64-af3c-a00700e254dd%7D/aushelper@mozilla.org.xpi!/bootstrap.js
> :: shutdown :: line 196"  data: no] Stack trace:
> shutdown()@resource://gre/modules/addons/XPIProvider.jsm ->
> jar:file:///home/joe/.mozilla/firefox/mwad0hks.default/features/%7B32b4a072-a8bb-4c64-af3c-a00700e254dd%7D/aushelper@mozilla.org.xpi!/bootstrap.js:196
> <
> this.XPIProvider.callBootstrapMethod()@resource://gre/modules/addons/XPIProvider.jsm:4968
> <
> this.XPIProvider.startup/<.observe()@resource://gre/modules/addons/XPIProvider.jsm:2924 
> 
> (firefox:13605): GLib-GObject-CRITICAL **: g_object_unref: assertion
> 'object->ref_count > 0' failed 
> 
>  
> 
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