Bug 263817 – Safari Web Extension content scripts (and scripting.executeScript) won't inject into about:srcdoc and about:blank iframes

• Status: NEW
• Component: WebKit Extensions

[Guilherme Rizzo]

I was trying to convert my extension to Safari Web Extension, but there's a major problem.

Setting a content script like this in the manifest.json:

"content_scripts": [
    {
      "matches": ["<all_urls>"],
      "match_about_blank": true,
      "match_origin_as_fallback": true,
      "include_globs": true,
      "all_frames": true,
      "js": ["main.js"]
    }
  ],

Won't inject the content script into iframes without a standard URL, for example, about:srcdoc as the URL.

Example page: https://tailwindui.com/components/application-ui/forms/form-layouts
This page has iframes that for Safari are "about:srcdoc" and the content script won't get injected into them.

I've tried adding/removing match_about_blank, match_origin_as_fallback, include_globs, all_frames, nothing worked.

The same happens if you try to inject it with browser.scripting.executeScript:
browser.scripting.executeScript({
      files: ['main.js'],
      target: {
        tabId: tab.id,
        allFrames: true,
      },
    })

This won't inject the script into about:srcdoc iframes. I've also tried directly specifying the frameIds and it still doesn't work.

[Radar WebKit Bug Importer]

<rdar://problem/117613804>

[Guilherme Rizzo]

PS: My host_permissions is "<all_urls>"

[Jeff Johnson]

This also applies to about:blank iframes. For the sake of searchability, can about:blank be added to the bug title?

[Jeff Johnson]

Here's an example of a page that causes major problems for my Safari web extension on iPhone:

https://www.barstoolsports.com/blog/3501810/dave-portnoy-has-cancelled-barstool-radio-until-further-notice-after-their-refusal-to-talk-about-barstool-drama-today

My extension has a number of video features, but the features don't work on this page, because there's a video in iframe src="about:blank" role="caffeine-embed", where my content script doesn't run. (Apparently the iframe is added to the page by setting the innerHTML of a parent element.)

[Guilherme Rizzo]

(In reply to Jeff Johnson from comment #3)
> This also applies to about:blank iframes. For the sake of searchability, can
> about:blank be added to the bug title?

Added "about:blank" to the title