Hi, could you please explain more about the issue. Was this previously working or are setting it up ? Did you install any thing new ? What A/V and Firewall program do you use please ? Thank You.

Separate Security Issue: Update your Flash Player or remove it using these links; http://helpx.adobe.com/flash-player/kb/uninstall-flash-player-windows.html Uninstall Flash Player | Windows http://helpx.adobe.com/flash-player/kb/uninstall-flash-player-mac-os.html Uninstall Flash Player | Mac

Note: Windows users should download the ActiveX for Internet Explorer. and the plugin for Plugin-based browsers (like Firefox).

Note: Windows 8 and Windows 10 have built-in flash players and Adobe will cause a conflict. Install the plugin only. Not the ActiveX.

Flash Player Version: Version 29.0.0.140

https://get.adobe.com/flashplayer/ Direct link scans current system and browser Note: Other software is offered in the download. <Windows Only>

https://get.adobe.com/flashplayer/otherversions/ Step 1: Select Operating System Step 2: Select A Version (Firefox, Win IE . . . .) Note: Other software is offered in the download. <Windows Only> +++++++++++++++++++ See if there are updates for your graphics drivers https://support.mozilla.org/en-US/kb/upgrade-graphics-drivers-use-hardware-acceleration

I updated Adobe Flash to current version. Didn't solve problem.

Tried to delete Adobe flash. Go through most of the steps but couldn't delete all the files. Said I needed permission from TrustedInsaller whatever that is. Any ideas?

Graphics card drivers are current.

Answer to Pkshadow. I have been using MyFitnessPal for 6 months. Suddenly can't access with Firefox. Firefox works well with all other sites. I use Google chrome to access MyFitnessPal with no problem. Nothing new installed that I can think of. A/V is Avast. Firewall just Windows 10. No changes there either.

jeffkatz said

I updated Adobe Flash to current version. Didn't solve problem.

Update your Flash Player is a Separate Security Issue

Said I needed permission from TrustedInsaller whatever that is

I think it means you need administrator privileges to remove those files.

Not Redirecting properly = cookies

Many site issues can be caused by corrupt cookies or cache.

• Clear the Cache and
• Remove Cookies

Warning ! ! This will log you out of sites you're logged in to. You may also lose any settings for that website.

• Cookies; Delete cookies to remove the information websites have stored on your computer {web link}

• Cache; How to clear the Firefox cache {web link}

If there is still a problem, Start Firefox in Safe Mode {web link} by holding down the <Shift> (Mac=Options) key, and then starting Firefox.

A small dialog should appear. Click Start In Safe Mode (not Refresh). Did this help?

While you are in safe mode;

Try disabling graphics hardware acceleration in Firefox. Since this feature was added to Firefox it has gradually improved but there are still a few glitches.

How to disable Hardware Acceleration {web link}

If none of the above should work - would you please take a look at this page and scroll down to :

'Can't Access MyFitnessPal - Troubleshooting instructions'

It mentions clearing the cache and cookies, which you say you've already tried, but also some other possible fixes :

http://www.isitdownrightnow.com/myfitnesspal.com.html

Some files said I needed administrator privilege. That was not a problem as I have that. TrustedInstaller seems to be different. I have never seen that one before.

jeffkatz said

Some files said I needed administrator privilege. That was not a problem as I have that. TrustedInstaller seems to be different. I have never seen that one before.

Would you please take a look at this article

And also these search results

In looking at the IsItWorking website, I have plenty of company. Seems the problem started after a Myfitnesspal update. I'll just wait for them to fix it.