Here's a portion of my manifest.json file:

  "content_scripts": [ {
"js": [ "common.js", "generation.js" ],
"matches": [ "*://www.site.com/*" ],
"run_at": "document_start"
},
{
"js": [ "page_init.js" ],
"matches": [ "*://www.site.com/*" ],
"run_at": "document_start"
},

Here, I want to run "common.js" before "page_init.js", as common.js contains much shared code and global variables and functions that the other content scripts need to function. I have defined common.js before page_init.js in my manifest, and, in Chrome, doing this results in common.js running before all the other content scripts, which is what I need. However, in Firefox, it doesn't seem to do this.

When I run this extension in Firefox, however, page_init throws an error:

ReferenceError: ReferenceError: href is not defined

"href" is a variable that's defined in common.js.

Do I need to make page_init.js run at document_end in order for common.js to fully run, or is there another way? I need them to both run at document_start.

UPDATE:

I managed to resolve the issue by changing the manifests contents to this:

 "content_scripts": [ 
{
"js": [ "common.js", "generation.js", "page_init.js" ],
"matches": [ "*://www.site.com/*" ],
"run_at": "document_start"
},