diff --git a/web/js-src/plugin-polyfill.js b/web/js-src/plugin-polyfill.js
index d215d78e7..da2397085 100644
--- a/web/js-src/plugin-polyfill.js
+++ b/web/js-src/plugin-polyfill.js
@@ -131,6 +131,8 @@ class RufflePluginArray {
 export const FLASH_PLUGIN = new RufflePlugin("Shockwave Flash", "Shockwave Flash 32.0 r0", "ruffle.js", [
     new RuffleMimeType("application/futuresplash", "Shockwave Flash", "spl"),
     new RuffleMimeType("application/x-shockwave-flash", "Shockwave Flash", "swf"),
+    new RuffleMimeType("application/x-shockwave-flash2-preview", "Shockwave Flash", "swf"),
+    new RuffleMimeType("application/vnd.adobe.flash-movie", "Shockwave Flash", "swf")
 ]);
 
 /**
@@ -161,4 +163,4 @@ export function install_plugin(plugin) {
     for (var i = 0; i < plugin.length; i += 1) {
         navigator.mimeTypes.install(plugin[i]);
     }
-}
\ No newline at end of file
+}
diff --git a/web/js-src/ruffle-embed.js b/web/js-src/ruffle-embed.js
index e5100a471..2dd446f82 100644
--- a/web/js-src/ruffle-embed.js
+++ b/web/js-src/ruffle-embed.js
@@ -1,4 +1,4 @@
-import { FLASH_MIMETYPE, FUTURESPLASH_MIMETYPE, is_swf_filename, RufflePlayer } from "./ruffle-player.js";
+import { FLASH_MIMETYPE, FUTURESPLASH_MIMETYPE, FLASH7_AND_8_MIMETYPE, FLASH_MOVIE_MIMETYPE, is_swf_filename, RufflePlayer } from "./ruffle-player.js";
 import { register_element } from "./register-element";
 
 export default class RuffleEmbed extends RufflePlayer {
@@ -34,7 +34,7 @@ export default class RuffleEmbed extends RufflePlayer {
     }
 
     static is_interdictable(elem) {
-        if (elem.type === FLASH_MIMETYPE || elem.type === FUTURESPLASH_MIMETYPE) {
+        if (elem.type === FLASH_MIMETYPE || elem.type === FUTURESPLASH_MIMETYPE || elem.type == FLASH7_AND_8_MIMETYPE || elem.type == FLASH_MOVIE_MIMETYPE) {
             return true;
         } else if (elem.type === undefined || elem.type === "") {
             return is_swf_filename(elem.src);
@@ -50,4 +50,4 @@ export default class RuffleEmbed extends RufflePlayer {
 
         return ruffle_obj;
     }
-}
\ No newline at end of file
+}
diff --git a/web/js-src/ruffle-object.js b/web/js-src/ruffle-object.js
index bae947874..2f276d6eb 100644
--- a/web/js-src/ruffle-object.js
+++ b/web/js-src/ruffle-object.js
@@ -1,4 +1,4 @@
-import { FLASH_MIMETYPE, FUTURESPLASH_MIMETYPE, FLASH_ACTIVEX_CLASSID, is_swf_filename, RufflePlayer } from "./ruffle-player.js";
+import { FLASH_MIMETYPE, FUTURESPLASH_MIMETYPE, FLASH7_AND_8_MIMETYPE, FLASH_MOVIE_MIMETYPE, FLASH_ACTIVEX_CLASSID, is_swf_filename, RufflePlayer } from "./ruffle-player.js";
 import { register_element } from "./register-element";
 
 export default class RuffleObject extends RufflePlayer {
@@ -28,7 +28,7 @@ export default class RuffleObject extends RufflePlayer {
     }
 
     static is_interdictable(elem) {
-        if (elem.type === FLASH_MIMETYPE || elem.type === FUTURESPLASH_MIMETYPE) {
+        if (elem.type === FLASH_MIMETYPE || elem.type === FUTURESPLASH_MIMETYPE || elem.type == FLASH7_AND_8_MIMETYPE || elem.type == FLASH_MOVIE_MIMETYPE) {
             return true;
         } else if (elem.attributes && elem.attributes.classid && elem.attributes.classid.value === FLASH_ACTIVEX_CLASSID) {
             return true;
@@ -61,4 +61,4 @@ export default class RuffleObject extends RufflePlayer {
 
         return ruffle_obj;
     }
-}
\ No newline at end of file
+}
diff --git a/web/js-src/ruffle-player.js b/web/js-src/ruffle-player.js
index fe41166bc..cd4e9c9c0 100644
--- a/web/js-src/ruffle-player.js
+++ b/web/js-src/ruffle-player.js
@@ -4,6 +4,8 @@ import { lookup_element } from "./register-element";
 
 export let FLASH_MIMETYPE = "application/x-shockwave-flash";
 export let FUTURESPLASH_MIMETYPE = "application/futuresplash";
+export let FLASH7_AND_8_MIMETYPE = "application/x-shockwave-flash2-preview";
+export let FLASH_MOVIE_MIMETYPE = "application/vnd.adobe.flash-movie";
 export let FLASH_ACTIVEX_CLASSID = "clsid:D27CDB6E-AE6D-11cf-96B8-444553540000";
 
 const DIMENSION_REGEX = /^\s*(\d+(\.\d+)?(%)?)/;