[extensions-web] Don't use InstallTrigger to detect Firefox and install xpi

[Yuri Konotopov <ykonotopov src gnome org>]

commit 1bcdec2a572924d83524167f585e3f68a70cb685
Author: Ksenia Berezina <kberezina mozilla com>
Date:   Thu Jun 30 23:51:43 2022 -0400

    Don't use InstallTrigger to detect Firefox and install xpi

 sweettooth/static/js/browser_extension.js | 13 ++-----------
 1 file changed, 2 insertions(+), 11 deletions(-)
---
diff --git a/sweettooth/static/js/browser_extension.js b/sweettooth/static/js/browser_extension.js
index a7e5265..af7778f 100644
--- a/sweettooth/static/js/browser_extension.js
+++ b/sweettooth/static/js/browser_extension.js
@@ -13,7 +13,7 @@ IS_CHROME     = (typeof(chrome) !== 'undefined' && (
        typeof(chrome.runtime) !== 'undefined' ||
        typeof(chrome.csi) !== 'undefined'
 ));
-IS_FIREFOX     = (typeof(InstallTrigger) !== 'undefined');
+IS_FIREFOX     = CSS.supports("-moz-appearance: none");
 IS_OPERA       = (typeof(opr) !== 'undefined');
 
 function browser_extension_install() {
@@ -30,16 +30,7 @@ function browser_extension_install() {
        }
        else if(IS_FIREFOX)
        {
-               // https://developer.mozilla.org/en-US/docs/Web/API/InstallTrigger/install
-               InstallTrigger.install({
-                       'GNOME Shell integration': {
-                               'URL':  
'https://addons.mozilla.org/firefox/downloads/latest/gnome-shell-integration/platform:2/addon-751081-latest.xpi'
-                       }
-               }, function(url, status) {
-                       if (status == 0) {
-                               reload_page();
-                       }
-               });
+               
window.location.assign('https://addons.mozilla.org/firefox/downloads/latest/gnome-shell-integration/platform:2/addon-751081-latest.xpi');
        }
        else if (IS_CHROME)
        {