diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6727711a3a..74f781c7e9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -6,9 +6,11 @@ on:
   push:
     branches:
       - main
+      - release/*
   pull_request:
     branches:
       - main
+      - release/*
   workflow_dispatch: {}
 
 jobs:
diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml
index ecb5d31ecc..cbdb71bdf8 100644
--- a/.github/workflows/docker.yml
+++ b/.github/workflows/docker.yml
@@ -3,11 +3,13 @@ on:
   push:
     branches:
       - main
+      - release/*
     tags:
       - "*"
   pull_request:
     branches:
       - main
+      - release/*
 jobs:
   docker:
     runs-on: ubuntu-latest
diff --git a/android/app/build.gradle b/android/app/build.gradle
index 655642f71a..628d3ff6a3 100644
--- a/android/app/build.gradle
+++ b/android/app/build.gradle
@@ -7,8 +7,8 @@ android {
         applicationId "app.vger.voyager"
         minSdkVersion rootProject.ext.minSdkVersion
         targetSdkVersion rootProject.ext.targetSdkVersion
-        versionCode 266
-        versionName "2.18.4"
+        versionCode 269
+        versionName "2.18.5"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         aaptOptions {
              // Files and dirs to omit from the packaged assets dir, modified to accommodate modern web apps.
diff --git a/ios/App/App/Info.plist b/ios/App/App/Info.plist
index fa472d58ac..c192d9584f 100644
--- a/ios/App/App/Info.plist
+++ b/ios/App/App/Info.plist
@@ -17,7 +17,7 @@
     <key>CFBundlePackageType</key>
     <string>APPL</string>
     <key>CFBundleShortVersionString</key>
-    <string>2.18.4</string>
+    <string>2.18.5</string>
     <key>CFBundleURLTypes</key>
     <array>
       <dict>
@@ -32,7 +32,7 @@
       </dict>
     </array>
     <key>CFBundleVersion</key>
-    <string>266</string>
+    <string>269</string>
     <key>ITSAppUsesNonExemptEncryption</key>
     <false/>
     <key>LSRequiresIPhoneOS</key>
diff --git a/package.json b/package.json
index 31783a3a70..38bf15a7fb 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "voyager",
   "description": "A progressive webapp Lemmy client",
   "private": true,
-  "version": "2.18.4",
+  "version": "2.18.5",
   "type": "module",
   "packageManager": "pnpm@9.6.0+sha512.38dc6fba8dba35b39340b9700112c2fe1e12f10b17134715a4aa98ccf7bb035e76fd981cf0bb384dfa98f8d6af5481c2bef2f4266a24bfa20c34eb7147ce0b5e",
   "scripts": {
diff --git a/src/features/media/gallery/GalleryMedia.tsx b/src/features/media/gallery/GalleryMedia.tsx
index 92028347ad..d1be21e7eb 100644
--- a/src/features/media/gallery/GalleryMedia.tsx
+++ b/src/features/media/gallery/GalleryMedia.tsx
@@ -34,8 +34,10 @@ export default forwardRef<
   ref,
 ) {
   const isGif = useMemo(
-    () => props.src && isUrlPotentialAnimatedImage(props.src),
-    [props.src],
+    () =>
+      props.src &&
+      isUrlPotentialAnimatedImage(props.src, post?.post.url_content_type),
+    [props.src, post],
   );
   const shouldAutoplay = useShouldAutoplay();
 
diff --git a/src/features/media/gallery/Media.tsx b/src/features/media/gallery/Media.tsx
index 5ca4021664..2f6ae34f66 100644
--- a/src/features/media/gallery/Media.tsx
+++ b/src/features/media/gallery/Media.tsx
@@ -13,7 +13,10 @@ const Media = forwardRef<
   ComponentRef<typeof Video> | ComponentRef<typeof GalleryMedia>,
   PostGalleryImgProps
 >(function Media({ nativeControls, src, ...props }, ref) {
-  const isVideo = useMemo(() => src && isUrlVideo(src), [src]);
+  const isVideo = useMemo(
+    () => src && isUrlVideo(src, props.post?.post.url_content_type),
+    [src, props.post],
+  );
 
   if (isVideo)
     return (
diff --git a/src/features/post/inFeed/compact/CompactPost.tsx b/src/features/post/inFeed/compact/CompactPost.tsx
index 809caa87cc..90a8595518 100644
--- a/src/features/post/inFeed/compact/CompactPost.tsx
+++ b/src/features/post/inFeed/compact/CompactPost.tsx
@@ -173,7 +173,7 @@ export default function CompactPost({ post }: PostProps) {
 
   const [domain] = useMemo(
     () =>
-      post.post.url && !isUrlImage(post.post.url)
+      post.post.url && !isUrlImage(post.post.url, post.post.url_content_type)
         ? parseUrlForDisplay(post.post.url)
         : [],
     [post],
diff --git a/src/features/post/inFeed/compact/Thumbnail.tsx b/src/features/post/inFeed/compact/Thumbnail.tsx
index 47763c0274..7bbb78c548 100644
--- a/src/features/post/inFeed/compact/Thumbnail.tsx
+++ b/src/features/post/inFeed/compact/Thumbnail.tsx
@@ -98,10 +98,11 @@ export default function Thumbnail({ post }: ImgProps) {
   );
 
   const postImageSrc = useMemo(() => {
-    if (post.post.url && isUrlImage(post.post.url)) return post.post.url;
+    if (post.post.url && isUrlImage(post.post.url, post.post.url_content_type))
+      return post.post.url;
 
     if (markdownLoneImage) return markdownLoneImage.url;
-  }, [markdownLoneImage, post.post.url]);
+  }, [markdownLoneImage, post.post]);
 
   const blurNsfw = useAppSelector(
     (state) => state.settings.appearance.posts.blurNsfw,
diff --git a/src/features/post/inFeed/usePostSrc.ts b/src/features/post/inFeed/usePostSrc.ts
index 1a0fc6f9e4..dfcc7eb805 100644
--- a/src/features/post/inFeed/usePostSrc.ts
+++ b/src/features/post/inFeed/usePostSrc.ts
@@ -4,9 +4,15 @@ import { useAppSelector } from "../../../store";
 import { IMAGE_FAILED } from "./large/imageSlice";
 import { findUrlMediaType } from "../../../helpers/url";
 import { findLoneImage } from "../../../helpers/markdown";
+import useSupported from "../../../helpers/useSupported";
 
 export default function usePostSrc(post: PostView): string | undefined {
-  const src = useMemo(() => getPostMedia(post), [post]);
+  const thumbnailIsFullsize = useSupported("Fullsize thumbnails");
+
+  const src = useMemo(
+    () => getPostMedia(post, thumbnailIsFullsize),
+    [post, thumbnailIsFullsize],
+  );
   const primaryFailed = useAppSelector(
     (state) => src && state.image.loadedBySrc[src[0]] === IMAGE_FAILED,
   );
@@ -18,24 +24,26 @@ export default function usePostSrc(post: PostView): string | undefined {
   return src[0];
 }
 
-export function getPostMedia(
+function getPostMedia(
   post: PostView,
+  thumbnailIsFullsize: boolean,
 ): [string] | [string, string] | undefined {
-  const urlType = post.post.url && findUrlMediaType(post.post.url);
-
-  if (post.post.url && urlType) {
-    const thumbnailType =
-      post.post.thumbnail_url && findUrlMediaType(post.post.thumbnail_url);
-
-    if (post.post.thumbnail_url) {
-      // Sometimes Lemmy will cache the video, sometimes the thumbnail will be a still frame of the video
-      if (urlType === "video" && thumbnailType === "image")
-        return [post.post.url];
-
-      return [post.post.thumbnail_url, post.post.url];
+  if (post.post.url) {
+    const isUrlMedia = findUrlMediaType(
+      post.post.url,
+      post.post.url_content_type,
+    );
+
+    if (isUrlMedia) {
+      if (post.post.thumbnail_url) {
+        if (thumbnailIsFullsize)
+          return [post.post.thumbnail_url, post.post.url];
+      }
+
+      // no fallback now for newer lemmy versions
+      // in the future might unwrap lemmy proxy_image param here
+      return [post.post.url];
     }
-
-    return [post.post.url];
   }
 
   if (post.post.thumbnail_url) return [post.post.thumbnail_url];
diff --git a/src/features/post/link/Link.tsx b/src/features/post/link/Link.tsx
index 135c9c9b82..ca489be70c 100644
--- a/src/features/post/link/Link.tsx
+++ b/src/features/post/link/Link.tsx
@@ -158,7 +158,7 @@ export default function Link({
     () => determineObjectTypeFromUrl(url) ?? determineTypeFromUrl(url),
     [url, determineObjectTypeFromUrl],
   );
-  const isImage = useMemo(() => isUrlImage(url), [url]);
+  const isImage = useMemo(() => isUrlImage(url, undefined), [url]);
 
   const handleLinkClick = (e: MouseEvent) => {
     e.stopPropagation();
diff --git a/src/features/post/new/PostEditorRoot.tsx b/src/features/post/new/PostEditorRoot.tsx
index f65ca866cd..9af5bfbf60 100644
--- a/src/features/post/new/PostEditorRoot.tsx
+++ b/src/features/post/new/PostEditorRoot.tsx
@@ -107,7 +107,9 @@ export default function PostEditorRoot({
   const existingPost = "existingPost" in props ? props.existingPost : undefined;
 
   const isImage = useMemo(
-    () => existingPost?.post.url && isUrlImage(existingPost.post.url),
+    () =>
+      existingPost?.post.url &&
+      isUrlImage(existingPost.post.url, existingPost.post.url_content_type),
     [existingPost],
   );
 
diff --git a/src/features/post/useIsPostUrlMedia.ts b/src/features/post/useIsPostUrlMedia.ts
index ad69debd32..b67832cff5 100644
--- a/src/features/post/useIsPostUrlMedia.ts
+++ b/src/features/post/useIsPostUrlMedia.ts
@@ -19,7 +19,7 @@ export default function useIsPostUrlMedia() {
         if (isRedgif(url)) return true;
       }
 
-      return !!findUrlMediaType(url);
+      return !!findUrlMediaType(url, post.post.url_content_type);
     },
     [embedExternalMedia],
   );
diff --git a/src/features/shared/markdown/MarkdownImg.tsx b/src/features/shared/markdown/MarkdownImg.tsx
index efa00c2b84..71da142bd1 100644
--- a/src/features/shared/markdown/MarkdownImg.tsx
+++ b/src/features/shared/markdown/MarkdownImg.tsx
@@ -20,7 +20,7 @@ interface MarkdownImgProps extends GalleryMediaProps {
 export default function MarkdownImg({ small, ...props }: MarkdownImgProps) {
   const sharedStyles = small ? smallStyles : undefined;
   const isVideo = useMemo(
-    () => props.src && isUrlVideo(props.src),
+    () => props.src && isUrlVideo(props.src, undefined),
     [props.src],
   );
 
diff --git a/src/helpers/url.ts b/src/helpers/url.ts
index 8bb0486e34..965377e7ba 100644
--- a/src/helpers/url.ts
+++ b/src/helpers/url.ts
@@ -53,7 +53,12 @@ export function getPotentialImageProxyPathname(
 
 const imageExtensions = ["jpeg", "png", "gif", "jpg", "webp", "jxl", "avif"];
 
-export function isUrlImage(url: string): boolean {
+export function isUrlImage(
+  url: string,
+  contentType: string | undefined,
+): boolean {
+  if (contentType?.startsWith("image/")) return true;
+
   const pathname = getPotentialImageProxyPathname(url);
 
   if (!pathname) return false;
@@ -63,9 +68,18 @@ export function isUrlImage(url: string): boolean {
   );
 }
 
-const animatedImageExtensions = ["gif", "webp", "jxl", "avif"];
+const animatedImageExtensions = ["gif", "webp", "jxl", "avif", "apng"];
+const animatedImageContentTypes = animatedImageExtensions.map(
+  (extension) => `image/${extension}`,
+);
+
+export function isUrlPotentialAnimatedImage(
+  url: string,
+  contentType: string | undefined,
+): boolean {
+  if (contentType && animatedImageContentTypes.includes(contentType))
+    return true;
 
-export function isUrlPotentialAnimatedImage(url: string): boolean {
   const pathname = getPotentialImageProxyPathname(url);
 
   if (!pathname) return false;
@@ -77,7 +91,12 @@ export function isUrlPotentialAnimatedImage(url: string): boolean {
 
 const videoExtensions = ["mp4", "webm", "gifv"];
 
-export function isUrlVideo(url: string): boolean {
+export function isUrlVideo(
+  url: string,
+  contentType: string | undefined,
+): boolean {
+  if (contentType?.startsWith("video/")) return true;
+
   const pathname = getPotentialImageProxyPathname(url);
   if (!pathname) return false;
 
@@ -86,10 +105,12 @@ export function isUrlVideo(url: string): boolean {
   );
 }
 
-export function findUrlMediaType(url: string): "video" | "image" | undefined {
-  if (isUrlImage(url)) return "image";
-
-  if (isUrlVideo(url)) return "video";
+export function findUrlMediaType(
+  url: string,
+  contentType: string | undefined, // not available on older lemmy instances <0.19.6?
+): "video" | "image" | undefined {
+  if (isUrlImage(url, contentType)) return "image";
+  if (isUrlVideo(url, contentType)) return "video";
 }
 
 // https://github.com/miguelmota/is-valid-hostname
diff --git a/src/helpers/useSupported.ts b/src/helpers/useSupported.ts
index 5ebfa2aa6f..3080285431 100644
--- a/src/helpers/useSupported.ts
+++ b/src/helpers/useSupported.ts
@@ -1,13 +1,18 @@
-import { compare } from "compare-versions";
+import { CompareOperator, compare } from "compare-versions";
+import { CommentSortType, PostSortType } from "lemmy-js-client";
+
 import { lemmyVersionSelector } from "../features/auth/siteSlice";
 import { useAppSelector } from "../store";
-import { CommentSortType, PostSortType } from "lemmy-js-client";
+
+const SUPPORTED_ON_OLDER_EXCLUSIVE = ">";
+const SUPPORTED_ON_NEWER_INCLUSIVE = "<=";
 
 /**
  * What Lemmy version was support added?
  */
 const featureVersionSupported = {
-  // "Instance Blocking": "0.19.0-rc.3",
+  // https://github.com/LemmyNet/lemmy-ui/issues/2796
+  "Fullsize thumbnails": ["0.19.6", SUPPORTED_ON_OLDER_EXCLUSIVE],
 } as const;
 
 type Feature = keyof typeof featureVersionSupported;
@@ -17,7 +22,18 @@ export default function useSupported(feature: Feature): boolean {
 
   if (!lemmyVersion) return false;
 
-  return compare(featureVersionSupported[feature], lemmyVersion, "<=");
+  const supported = featureVersionSupported[feature];
+
+  let comparator: CompareOperator = SUPPORTED_ON_NEWER_INCLUSIVE;
+  let version: string;
+  if (typeof supported === "string") {
+    version = supported;
+  } else {
+    version = supported[0];
+    comparator = supported[1];
+  }
+
+  return compare(version, lemmyVersion, comparator);
 }
 
 export function is019Sort(