Ce site disposera de fonctionnalités limitées pendant que nous effectuons des opérations de maintenance en vue de vous proposer un meilleur service. Si un article ne règle pas votre problème et que vous souhaitez poser une question, notre communauté d’assistance est prête à vous répondre via @FirefoxSupport sur Twitter, et /r/firefox sur Reddit.

Évitez les escroqueries à l’assistance. Nous ne vous demanderons jamais d’appeler ou d’envoyer un SMS à un numéro de téléphone ou de partager des informations personnelles. Veuillez signaler toute activité suspecte en utilisant l’option « Signaler un abus ».

En savoir plus

How to grant access to a website to extract canvas data without going to that website

  • 4 réponses
  • 0 a ce problème
  • 9 vues
  • Dernière réponse par cor-el

I can't grant access to a website because it's totally borked without canvas data, and keeps going on an infinite loading loop. This loading loop prevents me from having enough time to grant the permission, so I need to grant the permission to this website without actually visiting it.

I can't grant access to a website because it's totally borked without canvas data, and keeps going on an infinite loading loop. This loading loop prevents me from having enough time to grant the permission, so I need to grant the permission to this website without actually visiting it.

Toutes les réponses (4)

Do you have enabled "Resist Fingerprinting" as that is a possible cause for Canvas issues?

Can you post a link to a publicly accessible page (i.e. no authentication or signing on required)?


You can try to add the canvas exception via the Browser Console. You need to enable the command-line for the console.

Replace the https://xxxx with the correct origin (only protocol and hostname).

Services.perms.addFromPrincipal(
  Services.scriptSecurityManager.createContentPrincipalFromOrigin("https://xxxx"),
  "canvas", 1
);

cor-el said

Do you have enabled "Resist Fingerprinting" as that is a possible cause for Canvas issues? Can you post a link to a publicly accessible page (i.e. no authentication or signing on required)?

You can try to add the canvas exception via the Browser Console. You need to enable the command-line for the console.

Replace the https://xxxx with the correct origin (only protocol and hostname).

Services.perms.addFromPrincipal(
  Services.scriptSecurityManager.createContentPrincipalFromOrigin("https://xxxx"),
  "canvas", 1
);

It seems like perhaps this isn't the issue after all. I am still having the same issue. I've attached a picture that might be helpful. I used the browser console you mentioned to capture some logged info in a picture while the website was looping for a couple of seconds.

It would help others if you gave a URL so others can click to see what happens.

You would have to check the Requests in the Web Console or in the Network Monitor to see what is going on.