I can't install anything using Firefox

I switched to Mozilla from Chrome temporarily and Mozilla did not have Adobe Flash Player and i could not watch videos, so I tried to download it and it'll get to probably 99% and then stop. It does the same thing when i tried to install Chrome and Origin and I'm sure any other program. I have McAfee virus protection and I read that it might be stopping it from installing so i turned off the firewall and real-time scanning to try to install the programs again and it still did not work. I'm not so sure this is much of a Firefox issue and more of a computer issue but I'm really desperate to fix this issue.
edit: I tried to update the browser and it said the reason it could not update was "The integrity of the update could not be verified"

In the past there were two things:
# Scanwhendone turn off temporarily:
In order to change your Firefox Configuration please do the following steps :# In the [[Location bar autocomplete|Location bar]], type '''about:config''' and press '''Enter'''. The about:config "''This might void your warranty!''" warning page may appear.
# Click '''I'll be careful, I promise!''' to continue to the about:config page.
#look for scanwhendone which is a scanner that checks downloads before they complete.
2. #[[What to do if you can't download or save files]] and [https://support.mozilla.org/en-US/kb/update-failed-error-message-when-updating Update Failed Error Message]
I hope this helps.

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Whenever I try to download something from any site on the web it will not let me download.
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Hello Lucie.
You may be having a problem with some Firefox add-on that is hindering your Firefox's normal behavior. Have you tried disabling all add-ons (just to check), to see if Firefox goes back to normal?
Whenever you have a problem with Firefox, whatever it is, you should make sure it's not coming from one of your installed add-ons, be it an extension, a theme or a plugin. To do that easily and cleanly, run Firefox in [http://support.mozilla.com/en-US/kb/Safe+Mode safe mode] and select ''Disable all add-ons''. If the problem disappears, you know it's from an add-on. Disable them all in normal mode, and enable them one at a time until you find the source of the problem. See [http://support.mozilla.com/en-US/kb/Troubleshooting+extensions+and+themes this article] for information about troubleshooting extensions and theme. You can troubleshoot plugins the same way.
If you want support for one of your add-ons, you'll need to contact its author.

I can't print anything using firefox. My printer works fine with I.E. or Safari. Firefox is my default browser and I want to be able to print using it.

I've tried several different pages and websites and none of them will print. I'm using Windows 7 on a brand new Dell computer and Dell printer.
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[email protected]

See this:
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Please help! We got a used Mac Mini and we don't have the former owner's password, so we can't install anything like flash player. Does anyone know how to get around this?

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As posted previously:
Reinstall OS X without erasing the drive
Do the following:
1. Repair the Hard Drive and Permissions
Boot from your Snow Leopard Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer.
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If installing Leopard the process is similar in some respects. If you wish to begin anew then after selecting the target disk click on the Options button and select the Erase and Install option then click on the OK button. To install over an existing system do the following:
How to Perform an Archive and Install
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Repairing the Hard Drive and Permissions
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I can't print anything from Firefox. I get blank pages

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Thanks I will check out the site!

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Also, go to Control Panel/System Preferences in Windows/MAC and check whether Acrobat 9 is shown under installed programs list.
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[http://kb.mozillazine.org/Plugin_scanning Plugin scanning - MozillaZine Knowledge Base] (you would want to make sure it is ''not'' disabled; in about:config, filter on plugin.scan and see whether anything has been changed from its default)
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someone
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Hi, shoaib.
You wrote: "also in disk utility i get this
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• Micromat TechTool Pro version 4.1.x (TTP4).
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• Alsoft DiskWarrior and TechTool Pro.
Good luck!
Dr. Smoke
Author: Troubleshooting Mac® OS X
Note: The information provided in the link(s) above is freely available. However, because I own The X Lab™, a commercial Web site to which some of these links point, the Apple Discussions Terms of Use require I include the following disclosure statement with this post:
I may receive some form of compensation, financial or otherwise, from my recommendation or link.

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