Another user posted a similar question.

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).

Is the problem still there?

I AM LOOKING FOR A SOLUTION OTHER THAN STARTING IN SAFE MODE. REFRESHING FIREFOX DOES NOT HELP.

                              THANKS, JOHN

I am also having this problem with almost every web site I go to - including Firefox. Starting in safe mode is not an option for me.

This is a recent issue. Does Firefox need to change its programming?

I'm about to change to a new browser since this slows my work to an intolerable level.

Safe Mode is a troubleshooting mode that temporarily turns off hardware acceleration, resets some settings, and disables add-ons (extensions and themes). If the problem goes away, that tells us one thing. If it does not, that tells us something else.

I have this issue. Safe made makes no difference in the time it takes for these slow pages to load. I would rather turn off the notification and just wait instead of having to answer a monotonous pop-up every single time.

This issue with the popup 'bar' at the top of the viewing window started immediately when going from 47.0.1 to 49.0.1 Before the upgrade, the page was simply slow and pressing F5 may fix it or not. This seems to be an issue with slow mickey-mouse websites. Try IMVU forums for a current example.

I've called for more help.

Thank you - FredMcD

Add information. I thought there may be a possibility of malware or something so I did a full scan with Malewarebytes and AVG Pro. No hits.

I thought I would swap out chrome for Firefox over a couple of hours on the same website I normally spend time. chrome still had the random pauses (due to the regularly slow servers) but there were no errors. None, not even any timeouts, etc. I appreciate any input :)

ETA: (Sunday evening) I decided I miss my FireFox :/ so I found the installation program of 47.0.1 64bit and down-graded - YAY

I love my FireFox again. I now experience slight delays on loading some pages on a couple of normally / laggy sites but not the long delay and the error is gone :D

BOZONY said

IT ONLY APPEARS IN FIREFOX WHEN OPENING UP CHARTER.NET FOR MY EMAIL CHARTER DISAVOWS ANY PROBLEM FROM THEIR END. IE IS OK. THANKS. JOHN

I have this problem also, how do I get rid of this please. using windows10, and only on FF I get this. Don't even know how to get an answer for this :( :( :( please help me , thank you in advance.

I have this problem also, how do I get rid of this please. using windows10, and only on FF I get this. Don't even know how to get an answer for this :( :( :( please help me , thank you in advance.

I don't think I've seen that particular message.

Do any of the four of you use an ad blocking add-on? That may speed up loading of many sites if you want to try it. From time to time, content you want to see might also be blocked, so in that case, check the add-on's toolbar icon to allow ads in the page. For example:

https://addons.mozilla.org/firefox/addon/ublock-origin/

LestatDeLioncourt said above

I have this issue. Safe made makes no difference <<<more>>>

The only add-on I use is for shockwave. I have tried it in safe mode and manually disabled. It makes no difference.

Here is the deal to someone trying to recreate the issue. First you have to find a website that is loading so slow, you are on the verge of getting a 504 Timeout error. LoL (good luck finding one) Maybe some super geeks can figure out a way yo simulate one... idk

Anyway over the weekend, IMVU.com forum pages were so erratic and slow I was getting the error. As stated, I went back to 47.0.1 and all ws well. Today, the IMVU forums are running back like normal and version 49.0.1 is worked fine this morning. I have gone back to 47 for now hoping for an update.

If anyone wants to downgrade temporarily: Download the correct version for your OS Here: https://ftp.mozilla.org/pub/firefox/releases/47.0.1/ If you do this is recommend you read first, Here: https://support.mozilla.org/en-US/kb/install-older-version-of-firefox0

I would not recommend going much lower than the 47.n.n versions for security reasons. I hope this helps as a temporary fix.

~Enjoy

I do NOT use blocking Add-ons is there anything else to be done please????

delita said

I do NOT use blocking Add-ons is there anything else to be done please????

Is that a matter of principle? I was suggesting that you try one such as uBlock Origin. It will help in assessing whether ads are causing the problem.

FredMcD said

Safe Mode is a troubleshooting mode that temporarily turns off hardware acceleration, resets some settings, and disables add-ons (extensions and themes). If the problem goes away, that tells us one thing. If it does not, that tells us something else.

FredMcD said

I've called for more help.

pgdemars said I am getting it too

FredMcD said

Safe Mode is a troubleshooting mode that temporarily turns off hardware acceleration, resets some settings, and disables add-ons (extensions and themes). If the problem goes away, that tells us one thing. If it does not, that tells us something else.

FredMcD said

I've called for more help.

I am running windows 7 and getting the same problem

Based on further research, I believe this is a new way of reporting things like unresponsive scripts and plugins when you have the new e10s feature enabled (this was first "turned on" for some users in Firefox 48, and more users have it turned on in Firefox 49). e10s separates the browser interface and page content into separate processes. The goal is to make everything run more smoothly but some kinks are still being worked out.

Assuming this is related to a script in the page:

We have a general support article addressing potential solutions to this issue: Warning Unresponsive script - What it means and how to fix it.

Another common cause of unresponsive script errors on Windows 7-10 is the protected mode feature of the Flash player plugin. That feature has security benefits, but seems to have serious compatibility issues on some systems. You can disable it using the Add-ons page. Either:

• Ctrl+Shift+a
• "3-bar" menu button (or Tools menu) > Add-ons

In the left column, click Plugins. On the right side, find "Shockwave Flash" and click the More link. Then uncheck the box for "Enable Adobe Flash protected mode" and try that for a day to see whether it helps.

Thanks jscher2000 for the time and effort. The time (energies, etc.) you take for us is very much appreciated :)

Given: I have upgraded to the 49.0.1 again.

I have checked the Time-Out for the default wait time and it is already set to 20 so I left alone (guessing 20 seconds & long enough). I did uncheck the Flash Protected Mode as recommended in the referred article. I have also installed the YesScript Extension. I will report back and let everyone know what seems to help for me.

Fingers & Toes Crossed :D

jscher2000 said

In the left column, click Plugins. On the right side, find "Shockwave Flash" and click the More link. Then uncheck the box for "Enable Adobe Flash protected mode" and try that for a day to see whether it helps.

I have no options like these when clicking the "More" button. Only choices are Always Activate, ask to Activate, or Never Activate. I have the same problem as others too.

ETA: I restarted in Safe Mode, tried the page that was giving the problem (it was a video), and got the message that the Flash plugin had crashed. Not sure how to fix that.

Hi Greg_Beau, the protected mode checkbox may not appear in the Firefox 64-bit build for Windows because a built-in sandboxing feature is thought to render it superfluous. Do you run that version?

In that case, you may need to use the old method, but check out this article first: Adobe Flash plugin has crashed - Prevent it from happening again.

Here's the old method (various resources):

• Adobe support article under the heading "Last Resort": Adobe Forums: How do I troubleshoot Flash Player's protected mode for Firefox?

• Manual steps: https://support.mozilla.org/questions/968190?page=5#answer-509209

• Batch file to automate the manual steps: https://support.mozilla.org/questions/982093#answer-518078 (alternate version of Carm's batch file with a few changes by me: https://onedrive.live.com/?cid=f7d304d92388737d&id=F7D304D9238...)