When Firefox first loads, there is threatening script which quickly comes up and disappears, but I want to freeze and read it; but how?

Question

I am the victim of Identity Theft. The perpetrator has taken over as Roaming Administrator of my PC's. I once had 7 of them, but she has stolen/destroyed all but 2. She is taking online classes at college from Microsoft, and puts her class notes on one of the 2 surviving ones, which was returned to me by law enforcement. She has denied me access even to my "My Documents" subdirectory, &, in an ASUS AMD 8-core PC w/16GB of RAM, with a 3D blu-ray DVD reader/writer & 52-memory card reader/writer built in & a 2TB Western Digital eSATA HDD, all of which I designed & built, she has hidden the entire directory tree on the hard drive & rendered all of the other devices disabled so that the system is kaput; all because I was amassing evidence against her for law enforcement & the FTC.
The question at-hand is how I screen-freeze Firefox as it is loading so that I can read the JavaScript she has written at the bottom of the banner. It is something about how she has accessed my Norton Identity Safe Vault, changed the password on me, & shut off & denied me access to my 2 Facebook accounts & others I am not quick enough to read. I need to screen-capture this message for law enforcement, because they STILL, after a year & losing a total of $223,000 from my bank account to her, don't have a case file with them! PLEASE CAN YOU HELP ME! Katrina has actually hired a hit-man whom we have captured on surveillance video trying to shoot me in the head! She has also hacked her way into my router, changed my password & disabled the reset capability of the router so that even my ISP can't reset it! Imagine what YOU could do with $223,000! I am elderly, broke, and have lost almost 250 pounds because of her! If I live long enough, I want to see her in federal prison. If I die, I want her to die by lethal injection in Washington State for First Degree Murder!
FYI...I have used Firefox since its creation. The last time she wiped it off one of my systems & I reinstalled it, she caused it to install in Swedish. She has stolen the keys to all of my paid programs, & the companies now believe they actually belong to her, instead of myself. Norton 360 Premiere thinks I'm an intruder on my own machines, and Symanted has disabled my account, and will not communicate with me anymore. They gave her my Vault with more than 200 usernames and passwords! With GoDaddy, I had 17 non-profit SSL domains, for which I paid in excess of $8,000 to secure for 10 years with 21 email accounts. She obtained my SSN, impersonated me, demanded back the money I had paid, and they sent it to her. She stole the phone on which I had 2-step authentication, and now they won't let me near my accounts! I've had the same Gmail account for 8 years. Google opened up my password-secured YouTube account to 70,000+ strangers and pornography, and, after being LinkedIn's nominee for International Businesswoman of the Year, 2013, Google opened up my Wallet account to 2 other Identity Thieves to make purchases in my name, and they say I don't exist.
Lastly, she has poisoned our indoor spa with bio-terroristic flesh-eating parasites in the form of hybridized, skin-burrowing arthropods that killed our dog, cats, and dozens of birds in our special-needs avian sanctuary. I barely survived an 8-day stay in the hospital in June in, in "grave condition with toxic encephalopathy" because the parasites are immune to all parasiticides, and had crossed my blood-brain barrier. My husband has heart attacks, strokes and seizures constantly from them. I can no longer walk.
It is but one question I have asked, but your answer could be the key to stopping her from destroying what is left of our lives. With that JavaScripted message, she has cut me off from thousands of friends and family who have no idea what has happened to me. I live in a desolate, isolated corner of rural America without so much as phone or text service. All I have is the Internet and Firefox to keep me alive. If I can freeze that message and show it to the Whitman County Sheriff's Office, for whom I am the volunteer computer expert, they will accept their first-ever case of Identity Theft, and pursue her. It's bad enough that I lost the family fortune that my parents worked their whole lives to amass; I've lost my credibility, my self-esteem, and my will to live.
If you can help me, I plan on writing a book about the whole traumatic experience so that innocent others won't have to suffer the devastating nightmares as we have. Ours has been called, by the experts who should know, the worst case of Identity Theft in the history of the crime.
_{edit: removed identifiable personal information, since this is against our [[Forum rules and guidelines]] (philipp)}

Answer 1

Hi,
Troubleshooting a start up script can be difficult. There are some third party programs that also keep logs of start up programs, however for Firefox this may be different.
Is Firefox a startup program? [http://www.winxptutor.com/msinfo32.htm]
Its also possible to check the Web developer tools for any scripts in a page: [https://developer.mozilla.org/en-US/docs/Tools/Debugger]
In the control panel there is also Administrative tools to view event logs, but this may be something a local technician can walk you through.