[BUG] Images that can be interacted with won't save or display properly #200

100dogs commented 2025年11月14日 15:30:41 +01:00

Confirmation Checklist

• I confirm that this issue occurs on the latest release of Phoenix. You can check what the latest version is on the Releases page.
• I confirm that this issue has NOT already been reported on the Codeberg issue tracker, the GitLab issue tracker, and/or the GitHub issue tracker.

What web browser(s) are you using with Phoenix?

Firefox

Other

No response

What operating system(s) are you experiencing this issue on?

Debian

Other

No response

What version of Firefox/Gecko and Phoenix are you using?

140.5.0esr (Phoenix: 2025年11月07日.1)

If you remember, what version of Firefox/Gecko and Phoenix did you first notice the issue on?

140.5.0esr (Phoenix: 2025年11月07日.1)

Does the issue occur on a new browser profile?

• Yes
• No

Please share your browser's distribution ID.

default

Please share your browser's update channel.

No response

Please share a list of your currently installed browser add-ons/extensions, as well as the versions you have installed.

Bitwarden Password Manager - 2025100
Facebook Container - 2.3.12
Firefox Multi-Account Containers - 8.3.4
LibRedirect - 3.2.0
Mailvelope - Secure your email with PGP - 6.2.0
Reddit Enhancement Suite - 5.24.8
Skip Redirect - 2.3.6
uBlock Origin - 1.67.0
Wayback Machine - 3.2
XKit Rewritten - 1.1.2
Zotero Connector - 5.0.189

Please explain the issue you are experiencing.

Uploading or interactable images don't display properly (in fact I think the screenshot of the addons I uploaded is doing the very same...), and are instead just a bunch of lines. I've uploaded an example. I've restarted FF in troubleshooting mode & still having the same issue. Usually the canvas itself is fine, until an image is uploaded or saved.
Example: using an in-browser app like photopea to edit images.

Please provide detailed steps to reproduce the issue.

Any website where you can interact with an image.
Known: https://www.photopea.com/, https://www.piskelapp.com/, https://jspaint.app/

### Confirmation Checklist - [x] I confirm that this issue occurs on the **latest release** of Phoenix. You can check what the latest version is on [the `Releases` page](https://codeberg.org/celenity/Phoenix/releases). - [x] I confirm that this issue has **NOT** already been reported on [the Codeberg issue tracker](https://codeberg.org/celenity/Phoenix/issues), [the GitLab issue tracker](https://gitlab.com/celenityy/Phoenix/-/issues), **and/or** [the GitHub issue tracker](https://github.com/celenityy/Phoenix/issues). ### What web browser(s) are you using with Phoenix? Firefox ### Other _No response_ ### What operating system(s) are you experiencing this issue on? Debian ### Other _No response_ ### What version of Firefox/Gecko and Phoenix are you using? 140.5.0esr (Phoenix: 2025年11月07日.1) ### If you remember, what version of Firefox/Gecko and Phoenix did you first notice the issue on? 140.5.0esr (Phoenix: 2025年11月07日.1) ### Does the issue occur on a new browser profile? - [ ] Yes - [ ] No ### Please share your browser's distribution ID. default ### Please share your browser's update channel. _No response_ ### Please share a list of your currently installed browser add-ons/extensions, as well as the versions you have installed. Bitwarden Password Manager - 2025100 Facebook Container - 2.3.12 Firefox Multi-Account Containers - 8.3.4 LibRedirect - 3.2.0 Mailvelope - Secure your email with PGP - 6.2.0 Reddit Enhancement Suite - 5.24.8 Skip Redirect - 2.3.6 uBlock Origin - 1.67.0 Wayback Machine - 3.2 XKit Rewritten - 1.1.2 Zotero Connector - 5.0.189 ### Please explain the issue you are experiencing. Uploading or interactable images don't display properly (in fact I think the screenshot of the addons I uploaded is doing the very same...), and are instead just a bunch of lines. I've uploaded an example. I've restarted FF in troubleshooting mode & still having the same issue. Usually the canvas itself is fine, until an image is uploaded or saved. Example: using an in-browser app like photopea to edit images. ### Please provide detailed steps to reproduce the issue. Any website where you can interact with an image. Known: https://www.photopea.com/, https://www.piskelapp.com/, https://jspaint.app/

100dogs commented 2025年11月14日 15:35:26 +01:00

thought: might this have something to do with canvas blocker settings?

thought: might this have something to do with canvas blocker settings?

celenity commented 2025年11月25日 03:01:08 +01:00

Thanks for the report (and apologies for not getting back to you on this sooner).

@100dogs This indeed looks related to canvas data; when navigating to those sites, you should've received a prompt to allow extraction of canvas data. You'll want to allow it for the images to display properly.

If you already blocked it and need to reset the permission, you can temporarily set privacy.resistFingerprinting to true at about:config, navigate to the site, select the canvas icon on the URL bar, and select the x to the left of your current choice. You should then set privacy.resistFingerprinting back to false, and refresh the page (This work-around is needed due to an upstream bug ATM).

Please let me know if that doesn't resolve the issue.

Thanks for the report *(and apologies for not getting back to you on this sooner)*. @100dogs This indeed looks related to canvas data; when navigating to those sites, you should've received a prompt to allow extraction of canvas data. You'll want to allow it for the images to display properly. If you already blocked it and need to reset the permission, you can temporarily set `privacy.resistFingerprinting` to `true` at `about:config`, navigate to the site, select the canvas icon on the URL bar, and select the `x` to the left of your current choice. You should then set `privacy.resistFingerprinting` back to `false`, and refresh the page *(This work-around is needed due to an upstream bug ATM)*. Please let me know if that doesn't resolve the issue.

100dogs commented 2026年02月25日 14:51:03 +01:00

@celenity wrote in #200 (comment):

Thanks for the report (and apologies for not getting back to you on this sooner).

@100dogs This indeed looks related to canvas data; when navigating to those sites, you should've received a prompt to allow extraction of canvas data. You'll want to allow it for the images to display properly.

If you already blocked it and need to reset the permission, you can temporarily set privacy.resistFingerprinting to true at about:config, navigate to the site, select the canvas icon on the URL bar, and select the x to the left of your current choice. You should then set privacy.resistFingerprinting back to false, and refresh the page (This work-around is needed due to an upstream bug ATM).

Please let me know if that doesn't resolve the issue.

Hi, sorry this is such a late reply, but yes that seems to have fixed this issue! Thanks :)

@celenity wrote in https://codeberg.org/celenity/Phoenix/issues/200#issuecomment-8462259: > Thanks for the report _(and apologies for not getting back to you on this sooner)_. > > @100dogs This indeed looks related to canvas data; when navigating to those sites, you should've received a prompt to allow extraction of canvas data. You'll want to allow it for the images to display properly. > > If you already blocked it and need to reset the permission, you can temporarily set `privacy.resistFingerprinting` to `true` at `about:config`, navigate to the site, select the canvas icon on the URL bar, and select the `x` to the left of your current choice. You should then set `privacy.resistFingerprinting` back to `false`, and refresh the page _(This work-around is needed due to an upstream bug ATM)_. > > Please let me know if that doesn't resolve the issue. Hi, sorry this is such a late reply, but yes that seems to have fixed this issue! Thanks :)