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UserChrome script no longer working

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Have been using a script (.uc.js) in my profile/chrome folder to enable new-tab homepages via local files. After updating firefox ( 68.0b6, but I believe it appeared on b5) this functionality is gone. Instead it simply loads about:blank, seemingly showing that the script is not running at all.

Edit: upon further searching this seems to be to a change in Firefox 68 as a whole. Is there absolutely any way to regain this functionality?

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You can possibly set the new tab page via an autoconfig.cfg file.

This file is normally run in a sandbox that wouldn't allow this special code unless in ESR.

autoconfig.js in the "defaults\pref" folder.

pref("general.config.filename", "autoconfig.cfg");
pref("general.config.obscure_value", 0);
pref("general.config.sandbox_enabled", false);

autoconfig in the main Firefox program folder:

// first line is a comment
var {classes:Cc,interfaces:Ci,utils:Cu} = Components;

var newTabURL = "about:about"; // set new tab page
aboutNewTabService = Cc[";1"].getService(Ci.nsIAboutNewTabService);
aboutNewTabService.newTabURL = newTabURL;

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