# Content scripts are not loaded in Firefox on some web pages

**URL:** <https://discourse.mozilla.org/t/content-scripts-are-not-loaded-in-firefox-on-some-web-pages/60705>\
**Category:** Development\
**Created:** [May 25, 2020, 3:50pm UTC](https://discourse.mozilla.org/t/content-scripts-are-not-loaded-in-firefox-on-some-web-pages/60705 "2020-05-25T15:50:09Z")\
**Posts on this page:** 1\
**Showing post:** 1

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**Author:** ![marli](https://avatars.discourse-cdn.com/v4/letter/m/57b2e6/32.png) [@marli](https://discourse.mozilla.org/u/marli)\
**Post date:** [May 25, 2020, 3:50pm UTC](https://discourse.mozilla.org/t/content-scripts-are-not-loaded-in-firefox-on-some-web-pages/60705/1 "2020-05-25T15:50:09Z")

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I develop an extension in Firefox 76.0.1 and add a content script via content\_scripts in the manifest.js. I figured out that on some pages the script is not inserted into the page. For instance, [Address bar autocomplete suggestions in Firefox | Firefox Help](https://support.mozilla.org/en-US/kb/address-bar-autocomplete-firefox)  
Here, no script is loaded at all.  
Usually, it looks like this:

 ![Screenshot_20200525_174308](https://us1.discourse-cdn.com/flex001/uploads/mozilla/original/3X/f/7/f73dada514dcd1d1e993db8b5511d70b14ec25af.png)  
But on the mentioned pages it looks like this in the debugging tool:  
 ![Screenshot_20200525_174503](https://us1.discourse-cdn.com/flex001/uploads/mozilla/original/3X/a/2/a229ba9e7f0f9bdeca2d05f6e4cf8c9bc993c20b.png)

I found this issue:  
[Stackoverflow: Firefox content script not loading in some pages](https://stackoverflow.com/questions/47622435/firefox-content-script-not-loading-in-some-pages), where the problem was a Content-Security-Policy in the header of the page.  
But I don’t have such policy in my headers.

Does anybody has an idea what is wrong here?

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