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Firefox 18.0.2 installer's checksum is different from mozilla.org and mozilla.com, even though files are same length.

Posted

Shortly after installing Firefox 18.0.2 on a Windows 7 system, Firefox aborted and had to be restored ("Well this is embarassing..."). I uninstalled 18.0.2 using the Windows "Programs and Features" controller.

I then downloaded the 18.0.2 installer from www.mozilla.com, which re-directed me to "http://www.mozilla.org/en-US/firefox/new/", which I saved to my Desktop as "18-0-2_com". Windows complained that the file was not safe, although the most current version of Norton Internet Security, version 19.9.1.14, judged the file to be safe. When I ran the installer, Windows said the file was corrupt and stopped the installation.

Next, I went to www.mozilla.org, which re-directed me to a different site, "http://www.mozilla.org/en-US/products/download.html?product=firefox-18.0.2&os=win&lang=en-US". I saved the file as "18-0-2_org". Windows did not complain about the safety of this file, and it installed Firefox 18.0.2 without incident.

Since I run Cygwin 1.7.11-1, I was able to run the cksum command on both installer files. Here are the results:

Source Local file name File length CRC cksum


mozilla.com 18-0-2_com 20300952 3466106289 mozilla.org 18-0-2_org 20300952 1844093656

Although both installers have the same length, they differ in content; consequently, the checksums differ. It appears that 18-0-2_com is corrupt, while 18-0-2_org is not. Since the two files come from different locations, it seems that one has been accidentally or intentionally altered. Since the file lengths are the same, I am suspicious that the corrupted file has been made to look like the uncorrupted file, so that the number of bytes in both files is identical. This suggests that the corruption was deliberate.

Additional System Details

Application

  • User Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0; .NET CLR 2.0.50727; SLCC2; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; Media Center PC 5.0; SLCC1; Tablet PC 2.0)

More Information

Windows cannot open "troubleshooter.xpi".
Output from "manual steps" procedure:
Application Basics
Name
Firefox
Version
18.0.2
User Agent
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:18.0) Gecko/20100101 Firefox/18.0
Build Configuration
about:buildconfig
Extensions
Name
Version
Enabled
ID
DivX Plus Web Player HTML5 <video>
2.1.2.145
false
{23fcfd51-4958-4f00-80a3-ae97e717ed8b}
HP Smart Web Printing
4.51
false
smartwebprinting@hp.com
Norton Toolbar
2012.5.11.8
false
{2D3F3651-74B9-4795-BDEC-6DA2F431CB62}
Norton Vulnerability Protection
11.1.1.5 - 2
false
{BBDA0591-3099-440a-AA10-41764D9DB4DB}
We-Care Reminder
4.0.13.14
false
wecarereminder@bryan
Important Modified Preferences
Name
Value
browser.cache.disk.capacity
1048576
browser.cache.disk.smart_size.first_run
false
browser.cache.disk.smart_size_cached_value
1048576
browser.places.smartBookmarksVersion
4
browser.startup.homepage_override.buildID
20130201065344
browser.startup.homepage_override.mstone
18.0.2
extensions.lastAppVersion
18.0.2
gfx.direct3d.prefer_10_1
true
keyword.URL
http://websearch.ask.com/redirect?client=ff&src=kw&tb=AD2&o=102164&locale=en_US&apn_uid=0730c358-d9e1-4024-86d6-7fcc1669
network.cookie.prefsMigrated
true
places.database.lastMaintenance
1340247000
places.history.expiration.transient_current_max_pages
104858
privacy.sanitize.migrateFx3Prefs
true
security.warn_viewing_mixed
false
Graphics
Adapter Description
NVIDIA GeForce GT 430
Adapter Drivers
nvd3dumx,nvwgf2umx,nvwgf2umx nvd3dum,nvwgf2um,nvwgf2um
Adapter RAM
1023
Device ID
0x0de1
Direct2D Enabled
true
DirectWrite Enabled
true (6.1.7601.17789)
Driver Date
10-2-2012
Driver Version
9.18.13.697
GPU #2 Active
false
GPU Accelerated Windows
1/1 Direct3D 10
Vendor ID
0x10de
WebGL Renderer
Google Inc. -- ANGLE (NVIDIA GeForce GT 430)
AzureCanvasBackend
direct2d
AzureContentBackend
direct2d
AzureFallbackCanvasBackend
cairo
JavaScript
Incremental GC
true
Accessibility
Activated
true
Prevent Accessibility
0
Library Versions
Expected minimum version
Version in use
NSPR
4.9.4
4.9.4
NSS
3.14.1.0 Basic ECC
3.14.1.0 Basic ECC
NSSSMIME
3.14.1.0 Basic ECC
3.14.1.0 Basic ECC
NSSSSL
3.14.1.0 Basic ECC
3.14.1.0 Basic ECC
NSSUTIL
3.14.1.0
3.14.1.0

frucade 0 solutions 20 answers

Helpful Reply

I tried to download the FireFox setup from both locations you mentioned. I could not reproduce your problem. Always the same file with the same MD5 hash:

 C:\tmp>md5sum "Firefox Setup 18.0.2.exe
 181ac7211db54e793845e8c7216c1a8b *Firefox Setup 18.0.2.exe

Is it still reproducible from your location? Where are you located?