Sykje yn Support

Mij stipescams. Wy sille jo nea freegje in telefoannûmer te beljen, der in sms nei ta te stjoeren of persoanlike gegevens te dielen. Meld fertochte aktiviteit mei de opsje ‘Misbrûk melde’.

Learn More

JavaScript in firefox.cfg can't access `document`

  • 3 antwurd
  • 0 hawwe dit probleem
  • 84 werjeftes
  • Lêste antwurd fan jazali

more options

As I understand, `autoconfig.js` (with `firefox.cfg`) can be used to have JavaScript run during startup to control Firefox's UI elements.

I have set up `autoconfig.js` in my `/usr/lib/firefox-developer-edition/defaults/pref` folder (I'm on EndeavourOS Linux). As instructed here, I've already put the two required files, `autoconfig.js` and `firefox.cfg` in their correct folders (`/usr/lib/firefox-developer-edition/defaults/pref` and `/usr/lib/firefox-developer-edition` in my machine).

The file `firefox.cfg` contains the following code:

 //
 (() => {
   var tabbar = document.getElementById("TabsToolbar");
 })();


However, every time I run Firefox, this message will appear:

 "Failed to read the configuration file. Please contact your system administrator."


If I empty out the `firefox.cfg` file, Firefox will run normally without showing the error message. It will also run normally if I just have something like this in the file:

 //
 (() => {
   var testVar = "";
 })();


I don't understand why the JavaScript code can't access the Firefox UI elements through `document` or `window.document`. If `autoconfig.js` isn't build for that, what should I use to change my browser's UI elements through JavaScript?

Thank you.

As I understand, `autoconfig.js` (with `firefox.cfg`) can be used to have JavaScript run during startup to control Firefox's UI elements. I have set up `autoconfig.js` in my `/usr/lib/firefox-developer-edition/defaults/pref` folder (I'm on EndeavourOS Linux). As instructed [https://support.mozilla.org/en-US/kb/customizing-firefox-using-autoconfig here], I've already put the two required files, `autoconfig.js` and `firefox.cfg` in their correct folders (`/usr/lib/firefox-developer-edition/defaults/pref` and `/usr/lib/firefox-developer-edition` in my machine). The file `firefox.cfg` contains the following code: // (() => { var tabbar = document.getElementById("TabsToolbar"); })(); However, every time I run Firefox, this message will appear: "Failed to read the configuration file. Please contact your system administrator." If I empty out the `firefox.cfg` file, Firefox will run normally without showing the error message. It will also run normally if I just have something like this in the file: // (() => { var testVar = ""; })(); I don't understand why the JavaScript code can't access the Firefox UI elements through `document` or `window.document`. If `autoconfig.js` isn't build for that, what should I use to change my browser's UI elements through JavaScript? Thank you.
Keppele skermôfbyldingen

Bewurke troch jazali op

Keazen oplossing

Note that you need a lot more code to be able to access a browser window (i.e. add an observer that is triggered when you open a window).


// start autoconfig.cfg with a comment line
try {
 function ConfigJS() { Services.obs.addObserver(this, 'chrome-document-global-created', false); }
 ConfigJS.prototype = {
  observe: function (aSubject) { aSubject.addEventListener('DOMContentLoaded', this, {once: true}); },
  handleEvent: function (aEvent) {
   let document = aEvent.originalTarget;
   let window = document.defaultView;
   let location = window.location;

   if (/^(chrome:(?!\/\/(global\/content\/commonDialog|browser\/content\/webext-panels)\.x?html)|about:(?!blank))/i.test(location.href)) {
    if (window._gBrowser) { //place your code here
       var tabbar = window.document.getElementById("TabsToolbar");
    }  // gBrowser
   }   // location
  }    // handleEvent
 };    // prototype
 if (!Services.appinfo.inSafeMode) { new ConfigJS(); }
} catch(e) {Cu.reportError(e);}

Dit antwurd yn kontekst lêze 👍 0

Alle antwurden (3)

more options

Did you disable the sandbox via autoconfig.js ?

Content of autoconfig.js:

//start autoconfig.js with a comment line
pref("general.config.filename", "autoconfig.cfg");
pref("general.config.obscure_value", 0);
pref("general.config.sandbox_enabled", false);

Behelpsum?

more options

Keazen oplossing

Note that you need a lot more code to be able to access a browser window (i.e. add an observer that is triggered when you open a window).


// start autoconfig.cfg with a comment line
try {
 function ConfigJS() { Services.obs.addObserver(this, 'chrome-document-global-created', false); }
 ConfigJS.prototype = {
  observe: function (aSubject) { aSubject.addEventListener('DOMContentLoaded', this, {once: true}); },
  handleEvent: function (aEvent) {
   let document = aEvent.originalTarget;
   let window = document.defaultView;
   let location = window.location;

   if (/^(chrome:(?!\/\/(global\/content\/commonDialog|browser\/content\/webext-panels)\.x?html)|about:(?!blank))/i.test(location.href)) {
    if (window._gBrowser) { //place your code here
       var tabbar = window.document.getElementById("TabsToolbar");
    }  // gBrowser
   }   // location
  }    // handleEvent
 };    // prototype
 if (!Services.appinfo.inSafeMode) { new ConfigJS(); }
} catch(e) {Cu.reportError(e);}

Behelpsum?

more options

Hi. Thank you very much for the answer! My script can now access `document` thanks to your code. But I'm still confused on how to implement the following into the snipped you provided:

 var tabbar = window.document.getElementById("TabsToolbar");
 function showHideTabbar() {
   var sidebarBox = window.document.getElementById("sidebar-box");
   var sidebarTST = sidebarBox.getAttribute("sidebarcommand");
   if (!sidebarBox.hidden && sidebarTST === "treestyletab_piro_sakura_ne_jp-sidebar-action") {
     tabbar.style.visibility = "collapse";
   }
   else {
     tabbar.style.visibility = "visible";
   }
 }
 var observer = new MutationObserver(showHideTabbar);
 observer.observe(window.document.getElementById("sidebar-box"), { attributes: true, attributeFilter: ["sidebarcommand", "hidden"] });


Its purpose is to hide the tab strip on top when Tree Style Tab is open on the sidebar.

I found that it worked when I ran it through the Browser Toolbox. But it had no effect when I put it into the `if (window._gBrowser) {}` scope. I'm not too familiar with JavaScript, so I can't quite figure out what's wrong.

Bewurke troch jazali op

Behelpsum?

In fraach stelle

Jo moatte jo oanmelde by jo account om op berjochten te antwurdzjen. Stel in nije fraach as jo noch gjin account hawwe.