# 如何禁用 HTML5 canvas 图像数据的使用？
**URL:** https://meta.discourse.org/t/how-to-disable-use-of-html5-canvas-image-data/104637
**Category:** Support
**Created:** [2018年十二月19日 08:31 UTC](https://meta.discourse.org/t/how-to-disable-use-of-html5-canvas-image-data/104637 "2018-12-19T08:31:01Z")
**Posts on this page:** 10
**Page:** 1
### Author:  [@adrelanos](https://meta.discourse.org/u/adrelanos)
#### Post date: [2018年十二月19日 08:31 UTC](https://meta.discourse.org/t/how-to-disable-use-of-html5-canvas-image-data/104637/1 "2018-12-19T08:31:01Z")
After login to discourse forums, Tor Browser will show:
> Will you allow [forum.domain.org](http://forum.domain.org) to use your HTML5 canvas image data? This may be used to uniquely identify your computer.
How to disable use of HTML5 canvas image data?
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### Author:  [@zogstrip](https://meta.discourse.org/u/zogstrip)
#### Post date: [2018年十二月19日 09:35 UTC](https://meta.discourse.org/t/how-to-disable-use-of-html5-canvas-image-data/104637/2 "2018-12-19T09:35:40Z")
Does it show that on all Discourses? For example [https://try.discourse.org](https://try.discourse.org)?
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### Author:  [@adrelanos](https://meta.discourse.org/u/adrelanos)
#### Post date: [2018年十二月19日 11:42 UTC](https://meta.discourse.org/t/how-to-disable-use-of-html5-canvas-image-data/104637/3 "2018-12-19T11:42:36Z")
No, I could not reproduce on [https://try.discourse.org](https://try.discourse.org).
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### Author:  [@zogstrip](https://meta.discourse.org/u/zogstrip)
#### Post date: [2018年十二月19日 11:53 UTC](https://meta.discourse.org/t/how-to-disable-use-of-html5-canvas-image-data/104637/4 "2018-12-19T11:53:58Z")
Then maybe the Discourse(s) you tried is doing some fingerprinting?
We aren’t by default in Discourse. Unless they’ve installed the [discourse-fingerprinting](https://github.com/discourse/discourse-fingerprint) plugin (or they did it manually in a theme).
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### Author:  [@adrelanos](https://meta.discourse.org/u/adrelanos)
#### Post date: [2018年十二月21日 06:38 UTC](https://meta.discourse.org/t/how-to-disable-use-of-html5-canvas-image-data/104637/5 "2018-12-21T06:38:31Z")
Very strange. I am the admin of it and I didn’t add anything even remotely related to HTML5 canvas. (And I guess a server compromise to add HTML5 canvas is quite unlikely.) So I wouldn’t know what I did wrong.
> [@zogstrip](#):
>
> Unless they’ve installed the [discourse-fingerprinting](https://github.com/discourse/discourse-fingerprint) plugin
Not using any plugins (except the default docker manager plugin).
> [@zogstrip](#):
>
> (or they did it manually in a theme).
Using default theme.
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### Author:  [@Gulshan\_Kumar](https://meta.discourse.org/u/Gulshan_Kumar)
#### Post date: [2018年十二月21日 07:08 UTC](https://meta.discourse.org/t/how-to-disable-use-of-html5-canvas-image-data/104637/6 "2018-12-21T07:08:23Z")
Yes, I can confirm I also noticed same on the Tor browser.
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### Author:  [@zogstrip](https://meta.discourse.org/u/zogstrip)
#### Post date: [2018年十二月21日 07:57 UTC](https://meta.discourse.org/t/how-to-disable-use-of-html5-canvas-image-data/104637/7 "2018-12-21T07:57:06Z")
On [try.discourse.org](http://try.discourse.org) or on [meta.discourse.org](http://meta.discourse.org)?
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### Author:  [@adrelanos](https://meta.discourse.org/u/adrelanos)
#### Post date: [2018年十二月22日 12:51 UTC](https://meta.discourse.org/t/how-to-disable-use-of-html5-canvas-image-data/104637/8 "2018-12-22T12:51:25Z")
> [@zogstrip](#):
>
> On [try.discourse.org](http://try.discourse.org) or on [meta.discourse.org](http://meta.discourse.org)?
Can’t reproduce on neither.
> [@Gulshan\_Kumar](#):
>
> Yes, I can confirm I also noticed same on the Tor browser.
In which forum is it happening for you?
- In the forum where I am admin? (Don’t want to advertise it here, no need.)
- Or you don’t know me (good, in this case, ha) and it is happening for you in another forum?
Does it happen for you in [try.discourse.org](http://try.discourse.org) or on [meta.discourse.org](http://meta.discourse.org)?
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### Author:  [@system](https://meta.discourse.org/u/system)
#### Post date: [2021年十一月17日 09:34 UTC](https://meta.discourse.org/t/how-to-disable-use-of-html5-canvas-image-data/104637/9 "2021-11-17T09:34:52Z")
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### Author:  [@osioke](https://meta.discourse.org/u/osioke)
#### Post date: [2021年十一月17日 10:40 UTC](https://meta.discourse.org/t/how-to-disable-use-of-html5-canvas-image-data/104637/10 "2021-11-17T10:40:33Z")