A web page is slowing down your browser – Firefox


If you have been using Mozilla Firefox, at some or the other stage, you must have encountered a message – A web page is slowing down your browser. Users get an option to either ‘wait’ or ‘stop’ the troublesome webpage. At times, both choices don’t work. You could close the browser but that means losing your data, and even more, it isn’t a permanent solution.

A web page is slowing down your browser for Firefox

Further, a few users won’t be capable of close the browser window. It either freezes and forestalls responding. Despite multiple reports, Mozilla hasn’t been able to fix the trouble as it occurs with the state-of-the-art variations of the browser.

A web page is slowing down your browser – Firefox

This error usually occurs when browsing heavy pages or video sites like Google Maps, YouTube, etc. You could try the following solutions sequentially to resolve the problem:

  1. Clear Cookies and Site Data
  2. Update your graphics card driver
  3. Modify a few settings for Firefox
  4. Disable Adobe Flash Protected Mode.

1] Clear Cookies and Site Data

A mismatch in the cache stored on the system and the site data could cause the problem. Thus, we could clear the same. The procedure to remove cookies and site data is as follows:

Enter the following address in the address bar of the Firefox browser about:preferences#privacy.

Scroll to the Cookies and site data section and click on Clear data.

Clear Cookies
Check the boxes for both cache and cookies and click on Clear.

Clear Cookies, Site data, Cached Web content
Restart Firefox.

2] Update your graphics card driver

The relation among drivers and browser pages is that in case you strive commencing a graphics-in depth website, it consumes quite a few sources. It stresses the browser which may force to shut the troublesome webpage. To keep away from this type of state of affairs, the satisfactory we ought to do is hold the photographs card drivers updated.

Update graphics card driver


  1. Open Run prompt (Win + R) and type devmgmt.msc.
  2. Press Enter to open the Device Manager window.
  3. Expand the list of Display adapters and right-click on the graphics card driver.
  4. Select Update driver.
  5. Restart the system once done.

If this doesn’t work, there are multiple ways to update Drivers in Windows 10.

3] Modify a few settings for Firefox

A web page is slowing down your browser

  1. Copy the address about:config to the address bar and press Enter. It will open a warning page. Select I accept the risk to proceed.
  2. In the Search bar on the top of the page, search for processHang.
  3. It would display two entries dom.ipc.processHangMonitor and dom.ipc.reportProcessHangs.
  4. Right-click on these entries, and click on the Toggle option from True to False.
  5. Restart the browser and check if it resolves your problem.

4] Disable Adobe Flash Protected Mode

If updating the above does not help, disable the Adobe Flash Protected Mode as follows.

Launch the Firefox browser, click the Menu button and choose Add-ons. Next, select the Plugins option to expand the full list of plugins installed.

Then, uncheck the box marked against “Enable Adobe Flash protected mode” entry of the Shockwave Flash.

This can only be a temporary measure, as disabling the Adobe Flash Protected Mode could make your PC ‘less secure’.

Hope it helps to resolve this annoying problem in Firefox.