The crush reports a problem in libxul.so library it seem to me you are using linux Unbutu you can run

sudo apt-get install xulrunner-*

you may find and install the latest library that contain the libxul.so that is problematic to your system. you can also see this link

https://support.mozilla.org/en-US/questions/1076723

In Linux debian 8.1 the procedure i did follow was first to find a version of nighty that was allowing my favorite plugins to work without a problem no script and adblock plus and I was running it from terminal by typing

./firefox&

This way the terminal is used as output of errors and the error appears with the pid they get from the process that running in the background like

(firefox:1784): Gtk-CRITICAL **: IA__gtk_clipboard_set_with_data: assertion 'targets != NULL' failed (firefox:1784): Gtk-CRITICAL **: IA__gtk_clipboard_set_with_data: assertion 'targets != NULL' failed

the next step is to download the source and compile the browser just in case there is some incompatibility with the system I discovered that in a fresh install of debian I was missing so many libraries that you can’t believe it but in the end I did download and install all the libraries I was be able to view even the mobile site of this webside something I can’t do with the exe I download.

Too bad we can do the same and to windows is the best way to debug eveything.

I'm not sure I followed everything you said (I'm on the less technologically sophisticated end of things), but here's what I tried out:

(1) I ran

sudo apt-get install xulrunner-*

The output was

Reading package lists... Done Building dependency tree Reading state information... Done Note, selecting 'xulrunner-1.9.1' for regex 'xulrunner-*' Note, selecting 'xulrunner-1.9.2' for regex 'xulrunner-*' Note, selecting 'xulrunner-2.0-dev' for regex 'xulrunner-*' Note, selecting 'xulrunner-1.9' for regex 'xulrunner-*' Note, selecting 'xulrunner-2.0' for regex 'xulrunner-*' Note, selecting 'xulrunner-1.9-dev' for regex 'xulrunner-*' Note, selecting 'xulrunner-1.9.2-dev' for regex 'xulrunner-*' 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

So it seems like there was nothing missing there?

(2) I ran

firefox&

as you also mentioned. The only output I got was

[1] 10628

which doesn't seem as enlightening as the example you posted--though I'll admit I don't have a clue what it means.

The same crash behavior is still happening. So should I next download the Firefox source and compile it? And how exactly do I go about that?

Thanks!

I also find it strange try

sudo apt-get install xulrunner-2.0-dev

from the search you did it seems to me the latest are you sure you don't like to try a compile using the source? This way we can find the latest of what is missing and install it.

PS The number 10628 is the pid it get from running firefox in the background and if you got only this output it means it runned without an error else you will getting in the terminal all the errors firefox is creating with the form (firefox:10628) ....

if you continue have a problems dowload this version

https://ftp.mozilla.org/pub/firefox/releases/38.2.0esr/

at list we will make a compile with stable verified version. I suggest first dowload and run from a terminal again and while you using it see the terminal if is sending errors in there and once you verify is working without a problem we download the source and we make a compile if you like.

From my system's Update Manager, a new update for Firefox seems to have come out within the last few hours. I did that update, and things are now working again--no crashes upon launch.

Thanks for your assistance!

I suggest you continue running firefox from terminal with the & command and while you navigate always check the terminal if is sending errors for the compile i wrote i did once in my pc localy we can do it together publicly and you can change the topic of this threat to compile the latest version of firefox in unbutu i can use it for anynone.