Firefox Extension: Permission issue while accessing page content (similar to RankingsFactor SEO Chrome Extension)
I’ve developed a Firefox extension similar to the RankingsFactor SEO Chrome Extension, which analyzes on-page SEO elements such as meta tags, headings, links, and canonical tags.
The core functionality works fine in Chrome, but when I ported it to Firefox using the WebExtensions API, I’m facing permission issues while trying to access or read the page content (DOM).
Here’s what I’m trying to do:
Inject a content script to read <meta> tags, headings, and links.
Display this extracted data inside my extension popup.
However, in Firefox, the script doesn’t seem to have proper access to the page DOM — even though I’ve included "permissions": ["activeTab", "tabs", "<all_urls>"] in manifest.json.
I’d like to know:
Are there any additional permissions required in Firefox to read page content?
Does Firefox handle activeTab or content_scripts differently than Chrome?
Is there a specific event or user action needed to grant temporary permissions?
Any help, code examples, or guidance on fixing these permission restrictions would be appreciated.
Усі відповіді (1)
For Manifest v3, move your host permission to the host_permissions key. Also it needs to be written as a match pattern; <all_urls> is not available.