In this article, learn how to fix annoying 'Mozilla Firefox seems slow to start' notification, that keeps appearing when you start the browser.

If you’re regular user of Mozilla Firefox, you must be loving this browser due to recent UI changes. I’ve been using Firefox for more than 7 years and it always worked very well for me. Firefox also seems of great choice for the Windows 10 users, for whom Internet Explorer or Microsoft Edge is not working as they expected.

However, since few days, after updating Firefox, I keep receiving following notification on startup of the browser:

Mozilla Firefox seems slow… to… start.

FIX Mozilla Firefox Seems Slow To Start Notification

As you can see in the screenshot shown above, there are two options – Learn How to Speed It Up and Don’t Tell Me Again. If I choose first option, I’ll be taken to the guide to speed up the browser. If I choose second option, the notification gets disabled but comes back again, in successive sessions. Worth to mention here that my browser is working fine from performance point of view. So the notification is irrelevant to the condition and looks like spam.

So how to permanently disable this annoying notification? Well, if you’re also getting this notification, you can try below mentioned steps and see if they helps.

FIX: ‘Mozilla Firefox Seems Slow To Start’ Notification

1. Open Mozilla Firefox window, type about:config in the URL bar and hit Enter key. Click I accept the risk! option now.

FIX Mozilla Firefox Seems Slow To Start Notification

2. In the Search filter, type browser.slowStartup.notificationDisabled and you’ll be resulted Preference named browser.slowStartup.notificationDisabled which is set to false by default, which is the actual root cause of this problem. Right click on this preference setting and select Toggle in the context menu.

FIX Mozilla Firefox Seems Slow To Start Notification

3. This should set the preference value to true.

FIX Mozilla Firefox Seems Slow To Start Notification

That’s it, all you need to do is to restart Firefox and the notification will be blocked for ever.

Hope this helps you!

Also check: Awesome about:config Tweaks For Customization Of Mozilla Firefox

Share this post on Facebook · Twitter.

Leave a Reply

Your email address will not be published. Required fields are marked *

Recent Comments

  • Kapil Arya : ^^ Please refer suggestions provided here:

    20 hours ago

  • Kapil Arya : ^^ Thanks for adding this!...

    23 hours ago

  • Edward Riley : Did me no good. After installing 1903, no network shared devices were...

    1 day ago

  • Mitchell Mittman : This has been invaluable to me. Just wanted to point out something int...

    1 day ago

  • Kapil Arya : ^^ Have you also tried solutions at

    3 days ago