A web page slows down your browser

After a recent update of the Firefox browser, users reported that the browser started to slow down considerably before displaying the title error message. This problem is not unique to Windows users, since Mozilla Firefox users on other platforms have also complained about the error that occurred to them.

There are various methods that people have used to get their browser working properly again and all these methods are listed in this post. Make sure to follow all of them to fix your problem!!

Solution 1: disable Adobe Flash protected mode

This solution is intended for people who use desktop computers. 32 bits, since this option does not even exist in browsers running on Windows versions of 64 bits. The protected mode option is designed to keep you safe from intruders and malicious attacks, but even the folks at Mozilla recognize that it can cause constant crashes and errors like this. So you can disable it and check if that will solve your problem.

For Windows users of 64 bits, there is a different method located below this and it is a bit more advanced.

1. Open your Mozilla Firefox browser by double-clicking its icon on the desktop or by searching for it in the Start menu.

2. Click the menu button at the top right of the browser window and click Add-ons.

1. In the right pane of the screen, Locate and click the Add-ons option to see the full list of add-ons installed on your browser. Click Options next to the Shockwave Flash entry and remove the check mark next to the entry “Enable Adobe Flash Protected Mode”.

1. Check if the problem is resolved after restarting the browser.

Windows operating system users 64 bits:

1. Open File Explorer and try to navigate to this location from My Computer or This PC:

C: N-SysWOW64N-MacromedN-Flash

1. If you can't see any of the folders in the procedure, it is because hidden files are disabled on your system and you will have to enable viewing of them.

2. Click on the tab “Watch” in the File Explorer menu and click the box “Hidden items” in the Show section / To hide. File Explorer will show hidden files and remember this option until you change it again.

1. Look for a file called mms.cfg. Right click on it and choose Edit. Please note that you must have administrator rights to do so. If the file does not exist, right click anywhere in the Flash folder and choose New >> Text file. Save the file as “mms.cfg” and set the Save as type option to All types.

2. Either way, open the mms.cfg file and put the next line at the end of the document:

 ProtectedMode=0 

1. Save your changes and close Notepad. This change will take effect only after the Flash plugin is not fully in use, which means you will have to close Firefox and wait a couple of minutes.

Solution 2: clear Firefox browsing data

If a corrupted file managed to enter your computer through the browsing data that Firefox uses, you can expect to see some change in performance. This can only be fixed by deleting this file, therefore make sure to do so by deleting the browser data from Firefox, like cookies, Temporary files, etc.

1. Open your Mozilla Firefox browser by double-clicking its icon on the desktop or by searching for it in the Start menu.

2. Click the library button at the top right of the browser window (to the left of the menu button) and click History >> Delete recent history …

1. There are several options you can determine. In the option Time interval to delete, choose All by clicking the arrow that will open the drop-down list.

2. Click the arrow next to Details where you can see what will be deleted when you select the Delete history option. History in Firefox means much more than in Chrome, since the history in Firefox includes cookies, temporary data, etc.

1. We suggest you choose at least active browsing and download history, cookies, cache and logins before clicking Clear Now. Wait for the procedure to finish and restart your browser. Check if the problem is gone now.

Solution 3: update the graphics card driver

Having up-to-date drivers is a must even if you are not experiencing any problems at the moment, because outdated drivers can only create such problems. This time you can blame the video graphics card driver if you are using your browser to visit websites that consume a lot of graphics power. Update the driver and see if the problem persists.

1. Select the Start button, type Device Manager and select it from the list of results. You can also use the Windows key combination + R to open the Run dialog, where can you write Esc before clicking OK.

1. Expand one of the categories to find the name of your device, then right-click (or press and hold the button) and select the Update driver option. For graphics cards, expand the Display Adapters category, right click on your graphics card and select Update Driver.

1. Select Search automatically for updated driver software and follow the on-screen instructions to install it.

If this doesn't help, you can also visit the site of the manufacturer that made your graphics card and download the latest driver from their site. They often provide assistance in selecting the correct driver for your system. At the same time, new drivers are sometimes made public on the manufacturer's web portal long before they appear in Windows automatic search.

Later, always good to check if Firefox video settings are ok by following below steps:

1. Open your Mozilla Firefox browser by double-clicking its icon on the desktop or by searching for it in the Start menu.

2. Write the next address in the address bar or just copy it. Click Enter when done:

 about:preferences#privacy 

1. Navigate to the permissions section at the bottom of the window and look for a check mark next to the option Prevent accessibility services from accessing your browser. If the check mark is not there, put it yourself.

2. Navigate to the top of this window to General >> Performance and try unchecking all the alternatives. Change the recommended size below, but not below 2. Try adjusting this setting until you get it right.

Solution 4: YouTube error

If this problem only occurs with YouTube, may be due to its redesign, which can sometimes be a mistake. It is also resource intensive and reverting to the previous version of YouTube can fix the problem immediately.

1. Open your Mozilla Firefox browser by double-clicking its icon on the desktop or by searching for it in the Start menu. Write the address “youtube.com” in the address bar or just copy it.

2. Find the profile picture icon in the top right of the windows and click the down arrow.

3. Look for the option Restore the old Youtube in the drop-down menu. Take the Google questionnaire on why you are downgrading the site and see if YouTube continues to show the same error message.

Solution 5: disable two settings in about :: config

Disabling these settings in the settings resolved the issue for several users who were experiencing it. Then, now you can find the answer in most of the tech blogs that covered this problem. Follow the instructions and good luck.

1. Open your Mozilla Firefox browser by double-clicking its icon on the desktop or by searching for it in the Start menu.

2. Write the next address in the address bar or just copy it. Click Enter when done:

 about:config 

1. Search for processHang in the search bar at the top of the page and you should see two entries named “dom.ipc.processHangMonitor” Y “dom.ipc.reportProcessHangs”. Double click on both entries and change the status from true to false.

1. Save the changes and restart your browser to apply them. Check if the problem is solved.