diff --git a/pkgs/additional/firefox-extensions/default.nix b/pkgs/additional/firefox-extensions/default.nix
index 72b44912..af1d3428 100644
--- a/pkgs/additional/firefox-extensions/default.nix
+++ b/pkgs/additional/firefox-extensions/default.nix
@@ -1,6 +1,7 @@
 { stdenv
 , callPackage
 , fetchFirefoxAddon
+, gnused
 , jq
 , strip-nondeterminism
 , unzip
@@ -11,8 +12,8 @@ let
   # given an addon, repackage it without some `perm`ission
   removePermission = perm: addon: mkPatchedAddon addon {
     patchPhase = ''
-      NEW_MANIFEST=$(jq 'del(.permissions[] | select(. == "${perm}"))' "$out/$UUID/manifest.json")
-      echo "$NEW_MANIFEST" > "$out/$UUID/manifest.json"
+      NEW_MANIFEST=$(jq 'del(.permissions[] | select(. == "${perm}"))' manifest.json)
+      echo "$NEW_MANIFEST" > manifest.json
     '';
     nativeBuildInputs = [ jq ];
   };
@@ -39,19 +40,17 @@ let
       UUID="${extid}"
       echo "patching firefox addon $name into $out/$UUID.xpi"
 
-      # extract the XPI
-      mkdir -p "$out/$UUID"
-      unzip -q "${addon}/$UUID.xpi" -d "$out/$UUID"
+      # extract the XPI into the working directory
+      unzip -q "${addon}/$UUID.xpi" -d "."
     '';
 
     installPhase = ''
       runHook preInstall
 
       # repackage the XPI
-      cd "$out/$UUID"
-      zip -r -q -FS "$out/$UUID.xpi" *
+      mkdir "$out"
+      zip -r -q -FS "$out/$UUID.xpi" ./*
       strip-nondeterminism "$out/$UUID.xpi"
-      rm -r "$out/$UUID"
 
       runHook postInstall
     '';
@@ -91,7 +90,17 @@ in {
   ether-metamask = addon "ether-metamask" "webextension@metamask.io" "sha256-UI83wUUc33OlQYX+olgujeppoo2D2PAUJ+Wma5mH2O0=";
   i2p-in-private-browsing = addon "i2p-in-private-browsing" "i2ppb@eyedeekay.github.io" "sha256-dJcJ3jxeAeAkRvhODeIVrCflvX+S4E0wT/PyYzQBQWs=";
   sidebery = addon "sidebery" "{3c078156-979c-498b-8990-85f7987dd929}" "sha256-YONfK/rIjlsrTgRHIt3km07Q7KnpIW89Z9r92ZSCc6w=";
-  sponsorblock = addon "sponsorblock" "sponsorBlocker@ajay.app" "sha256-b/OTFmhSEUZ/CYrYCE4rHVMQmY+Y78k8jSGMoR8vsZA=";
+  sponsorblock = mkPatchedAddon
+    (addon "sponsorblock" "sponsorBlocker@ajay.app" "sha256-b/OTFmhSEUZ/CYrYCE4rHVMQmY+Y78k8jSGMoR8vsZA=")
+    {
+      patchPhase = ''
+        # patch sponsorblock to not show the help tab on first launch.
+        # XXX: i tried to build sponsorblock from source and patch this *before* it gets webpack'd,
+        # but web shit is absolutely cursed and building from source requires a fucking PhD
+        # (if you have one, feel free to share your nix package)
+        ${gnused}/bin/sed -i 's/default\.config\.userID)/default.config.userID && false)/' js/background.js
+      '';
+    };
   ublacklist = addon "ublacklist" "@ublacklist" "sha256-NZ2FmgJiYnH7j2Lkn0wOembxaEphmUuUk0Ytmb0rNWo=";
   ublock-origin = addon "ublock-origin" "uBlock0@raymondhill.net" "sha256-EGGAA+cLUow/F5luNzFG055rFfd3rEyh8hTaL/23pbM=";
 }