Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

Avatar for Username

Zoeken in Support

Vermijd ondersteuningsscams. We zullen u nooit vragen een telefoonnummer te bellen, er een sms naar te sturen of persoonlijke gegevens te delen. Meld verdachte activiteit met de optie ‘Misbruik melden’.

Meer info

Deze conversatie is gearchiveerd. Stel een nieuwe vraag als u hulp nodig hebt.

Navigation from the new tab page to a website results in blocked files in developer console

interbred.monkey
interbred.monkey
more options

When using Firefox I have noticed that viewing the new tab page with the developer console open and navigating to a different website, some of the files (CSS, JS, images) that are in use by the website are blocked by devtools.

If you then refresh the page none of the files the site uses are blocked, similarly if you double click a blocked file Firefox will open the file in a separate tab. I am also able to resend the request for a blocked file and it will result in a 200 response.

The problem only seems to occur when navigating from the new tab page as I have also tried the same test when starting from another website like Google results. I've also tried various websites with the same results.

A video capture of testing can be found here: https://streamable.com/amx9df

I'm wondering if this is some sort of prefetch that has been blocked or it has been documented somewhere before? Obviously the sites are not unusable but it is quite confusing when loading websites to see assets being blocked but the page loading correctly.

Thanks.

When using Firefox I have noticed that viewing the new tab page with the developer console open and navigating to a different website, some of the files (CSS, JS, images) that are in use by the website are blocked by devtools. If you then refresh the page none of the files the site uses are blocked, similarly if you double click a blocked file Firefox will open the file in a separate tab. I am also able to resend the request for a blocked file and it will result in a 200 response. The problem only seems to occur when navigating from the new tab page as I have also tried the same test when starting from another website like Google results. I've also tried various websites with the same results. A video capture of testing can be found here: https://streamable.com/amx9df I'm wondering if this is some sort of prefetch that has been blocked or it has been documented somewhere before? Obviously the sites are not unusable but it is quite confusing when loading websites to see assets being blocked but the page loading correctly. Thanks.
Gekoppelde schermafbeeldingen

Alle antwoorden (3)

jscher2000 - Support Volunteer
jscher2000 - Support Volunteer
  • Top 25 Contributor
more options

Hmm, there is a feature in the Network Monitor to block exact URLs or URLs that match a pattern. Do you have a little circle-slash icon to open the list:

<center></center>

Note: If you include a URL in a reply, including the above image URL, your post will be delayed while it transits the link moderation queue.

interbred.monkey
interbred.monkey Vraageigenaar
more options

I've opened the blocked URL section and there is none listed. The only time I have seen the URL of the asset in that list is when I have clicked the "block" button when selecting a blocked request.

interbred.monkey
interbred.monkey Vraageigenaar
more options

As a follow up, I've found that a new private tab does not reflect this issue and works as expected on all websites I have tested.