| Index: lib/csp.js | 
| =================================================================== | 
| --- a/lib/csp.js | 
| +++ b/lib/csp.js | 
| @@ -16,25 +16,25 @@ | 
| */ | 
|  | 
| "use strict"; | 
|  | 
| // The webRequest API doesn't support WebSocket connection blocking in Microsoft | 
| // Edge and versions of Chrome before 58. Therefore for those we inject CSP | 
| // headers below as a workaround. See https://crbug.com/129353 and | 
| // https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/10297376/ | 
| -if (!chrome.webRequest.ResourceType || | 
| -    !("WEBSOCKET" in chrome.webRequest.ResourceType)) | 
| +if (!browser.webRequest.ResourceType || | 
| +    !("WEBSOCKET" in browser.webRequest.ResourceType)) | 
| { | 
| const {defaultMatcher} = require("matcher"); | 
| const {BlockingFilter, RegExpFilter} = require("filterClasses"); | 
| const {getDecodedHostname} = require("url"); | 
| const {checkWhitelisted} = require("whitelisting"); | 
|  | 
| -  chrome.webRequest.onHeadersReceived.addListener(details => | 
| +  browser.webRequest.onHeadersReceived.addListener(details => | 
| { | 
| let hostname = getDecodedHostname(new URL(details.url)); | 
| let match = defaultMatcher.matchesAny("", RegExpFilter.typeMap.WEBSOCKET, | 
| hostname, false, null, true); | 
| if (match instanceof BlockingFilter && | 
| !checkWhitelisted(new ext.Page({id: details.tabId}), | 
| ext.getFrame(details.tabId, details.frameId))) | 
| { | 
|  |