Add advanced setting to control logger popup type

Related issue:
- https://github.com/uBlockOrigin/uBlock-issues/issues/663

The advanced setting `loggerPopupType` has been added, to
control the type of window to be used when the logger is
launched as a separate window.

The default value is `popup`, it can be changed to any of
the values documented at:

https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/windows/CreateType

platform/chromium/vapi-background.js

@@ -387,11 +387,11 @@ vAPI.Tabs = class {
 
     // Properties of the details object:
     // - url: 'URL',    => the address that will be opened
-    // - index: -1,     => undefined: end of the list, -1: following tab, or
+    // - index: -1,     => undefined: end of the list, -1: following tab,
-    //                     after index
+    //                     or after index
-    // - active: false, => opens the tab in background - true and undefined:
+    // - active: false, => opens the tab... in background: true,
-    //                     foreground
+    //                     foreground: undefined
-    // - popup: true    => open in a new window
+    // - popup: 'popup' => open in a new window
 
     create(url, details) {
         if ( details.active === undefined ) {
@@ -443,10 +443,10 @@ vAPI.Tabs = class {
         // For some reasons, some platforms do not honor the left,top
         // position when specified. I found that further calling
         // windows.update again with the same position _may_ help.
-        if ( details.popup === true && browser.windows instanceof Object ) {
+        if ( details.popup !== undefined && browser.windows instanceof Object ) {
             const createDetails = {
                 url: details.url,
-                type: 'popup',
+                type: details.popup,
             };
             if ( details.box instanceof Object ) {
                 Object.assign(createDetails, details.box);

src/js/background.js

@@ -52,6 +52,7 @@ const µBlock = (function() { // jshint ignore:line
         disableWebAssembly: false,
         ignoreRedirectFilters: false,
         ignoreScriptInjectFilters: false,
+        loggerPopupType: 'popup',
         manualUpdateAssetFetchPeriod: 500,
         popupFontSize: 'unset',
         requestJournalProcessPeriod: 1000,

src/js/utils.js

@@ -386,8 +386,8 @@
                 !this.userSettings.alwaysDetachLogger
             );
         }
-        details.popup = this.userSettings.alwaysDetachLogger;
+        if ( this.userSettings.alwaysDetachLogger ) {
-        if ( details.popup ) {
+            details.popup = this.hiddenSettings.loggerPopupType;
             const url = new URL(vAPI.getURL(details.url));
             url.searchParams.set('popup', '1');
             details.url = url.href;