diff --git a/flake.nix b/flake.nix
index 41e69032..5021151e 100644
--- a/flake.nix
+++ b/flake.nix
@@ -131,7 +131,7 @@
             wasm.outputs = {
               squiggle-wasm-lint = mc.rust-lint;
               squiggle-wasm-pkg = mc.webpack-build-pkg;
-              squiggle-wasm-test-ff = mc.rust-firefox-test;
+              squiggle-wasm-test-ff = mc.firefox-test;
             };
             lang.outputs = {
               squiggle-lang-lint = lang.lint;
diff --git a/packages/mc/Cargo.nix b/packages/mc/Cargo.nix
index 1fee7081..3bf90eef 100644
--- a/packages/mc/Cargo.nix
+++ b/packages/mc/Cargo.nix
@@ -4,7 +4,7 @@
 args@{
   release ? true,
   rootFeatures ? [
-    "quri-squiggle-mc/default"
+    "quri_squiggle_mc/default"
   ],
   rustPackages,
   buildRustPackages,
@@ -38,7 +38,7 @@ in
 {
   cargo2nixVersion = "0.11.0";
   workspace = {
-    quri-squiggle-mc = rustPackages.unknown.quri-squiggle-mc."0.0.1";
+    quri_squiggle_mc = rustPackages.unknown.quri_squiggle_mc."0.0.1";
   };
   "registry+https://github.com/rust-lang/crates.io-index".aho-corasick."0.7.18" = overridableMkRustCrate (profileName: rec {
     name = "aho-corasick";
@@ -659,14 +659,14 @@ in
     };
   });
   
-  "unknown".quri-squiggle-mc."0.0.1" = overridableMkRustCrate (profileName: rec {
-    name = "quri-squiggle-mc";
+  "unknown".quri_squiggle_mc."0.0.1" = overridableMkRustCrate (profileName: rec {
+    name = "quri_squiggle_mc";
     version = "0.0.1";
     registry = "unknown";
     src = fetchCrateLocal workspaceSrc;
     features = builtins.concatLists [
-      (lib.optional (rootFeatures' ? "quri-squiggle-mc/default") "default")
-      (lib.optional (rootFeatures' ? "quri-squiggle-mc/default" || rootFeatures' ? "quri-squiggle-mc/wee_alloc") "wee_alloc")
+      (lib.optional (rootFeatures' ? "quri_squiggle_mc/default") "default")
+      (lib.optional (rootFeatures' ? "quri_squiggle_mc/default" || rootFeatures' ? "quri_squiggle_mc/wee_alloc") "wee_alloc")
     ];
     dependencies = {
       cached = rustPackages."registry+https://github.com/rust-lang/crates.io-index".cached."0.38.0" { inherit profileName; };
@@ -678,7 +678,7 @@ in
       statistics = rustPackages."registry+https://github.com/rust-lang/crates.io-index".statistics."0.4.1" { inherit profileName; };
       wasm_bindgen = rustPackages."registry+https://github.com/rust-lang/crates.io-index".wasm-bindgen."0.2.82" { inherit profileName; };
       web_sys = rustPackages."registry+https://github.com/rust-lang/crates.io-index".web-sys."0.3.59" { inherit profileName; };
-      ${ if rootFeatures' ? "quri-squiggle-mc/default" || rootFeatures' ? "quri-squiggle-mc/wee_alloc" then "wee_alloc" else null } = rustPackages."registry+https://github.com/rust-lang/crates.io-index".wee_alloc."0.4.5" { inherit profileName; };
+      ${ if rootFeatures' ? "quri_squiggle_mc/default" || rootFeatures' ? "quri_squiggle_mc/wee_alloc" then "wee_alloc" else null } = rustPackages."registry+https://github.com/rust-lang/crates.io-index".wee_alloc."0.4.5" { inherit profileName; };
     };
     devDependencies = {
       futures = rustPackages."registry+https://github.com/rust-lang/crates.io-index".futures."0.1.31" { inherit profileName; };
@@ -1140,14 +1140,14 @@ in
     registry = "registry+https://github.com/rust-lang/crates.io-index";
     src = fetchCratesIo { inherit name version; sha256 = "dbb3b5a6b2bb17cb6ad44a2e68a43e8d2722c997da10e928665c72ec6c0a0b8e"; };
     features = builtins.concatLists [
-      (lib.optional (rootFeatures' ? "quri-squiggle-mc/default" || rootFeatures' ? "quri-squiggle-mc/wee_alloc") "default")
-      (lib.optional (rootFeatures' ? "quri-squiggle-mc/default" || rootFeatures' ? "quri-squiggle-mc/wee_alloc") "size_classes")
+      (lib.optional (rootFeatures' ? "quri_squiggle_mc/default" || rootFeatures' ? "quri_squiggle_mc/wee_alloc") "default")
+      (lib.optional (rootFeatures' ? "quri_squiggle_mc/default" || rootFeatures' ? "quri_squiggle_mc/wee_alloc") "size_classes")
     ];
     dependencies = {
-      ${ if rootFeatures' ? "quri-squiggle-mc/default" || rootFeatures' ? "quri-squiggle-mc/wee_alloc" then "cfg_if" else null } = rustPackages."registry+https://github.com/rust-lang/crates.io-index".cfg-if."0.1.10" { inherit profileName; };
-      ${ if (rootFeatures' ? "quri-squiggle-mc/default" || rootFeatures' ? "quri-squiggle-mc/wee_alloc") && hostPlatform.isUnix && !(hostPlatform.parsed.cpu.name == "wasm32") then "libc" else null } = rustPackages."registry+https://github.com/rust-lang/crates.io-index".libc."0.2.132" { inherit profileName; };
-      ${ if rootFeatures' ? "quri-squiggle-mc/default" || rootFeatures' ? "quri-squiggle-mc/wee_alloc" then "memory_units" else null } = rustPackages."registry+https://github.com/rust-lang/crates.io-index".memory_units."0.4.0" { inherit profileName; };
-      ${ if (rootFeatures' ? "quri-squiggle-mc/default" || rootFeatures' ? "quri-squiggle-mc/wee_alloc") && hostPlatform.parsed.kernel.name == "windows" then "winapi" else null } = rustPackages."registry+https://github.com/rust-lang/crates.io-index".winapi."0.3.9" { inherit profileName; };
+      ${ if rootFeatures' ? "quri_squiggle_mc/default" || rootFeatures' ? "quri_squiggle_mc/wee_alloc" then "cfg_if" else null } = rustPackages."registry+https://github.com/rust-lang/crates.io-index".cfg-if."0.1.10" { inherit profileName; };
+      ${ if (rootFeatures' ? "quri_squiggle_mc/default" || rootFeatures' ? "quri_squiggle_mc/wee_alloc") && hostPlatform.isUnix && !(hostPlatform.parsed.cpu.name == "wasm32") then "libc" else null } = rustPackages."registry+https://github.com/rust-lang/crates.io-index".libc."0.2.132" { inherit profileName; };
+      ${ if rootFeatures' ? "quri_squiggle_mc/default" || rootFeatures' ? "quri_squiggle_mc/wee_alloc" then "memory_units" else null } = rustPackages."registry+https://github.com/rust-lang/crates.io-index".memory_units."0.4.0" { inherit profileName; };
+      ${ if (rootFeatures' ? "quri_squiggle_mc/default" || rootFeatures' ? "quri_squiggle_mc/wee_alloc") && hostPlatform.parsed.kernel.name == "windows" then "winapi" else null } = rustPackages."registry+https://github.com/rust-lang/crates.io-index".winapi."0.3.9" { inherit profileName; };
     };
   });
   
@@ -1157,12 +1157,12 @@ in
     registry = "registry+https://github.com/rust-lang/crates.io-index";
     src = fetchCratesIo { inherit name version; sha256 = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"; };
     features = builtins.concatLists [
-      (lib.optional (rootFeatures' ? "quri-squiggle-mc/default" || rootFeatures' ? "quri-squiggle-mc/wee_alloc") "memoryapi")
+      (lib.optional (rootFeatures' ? "quri_squiggle_mc/default" || rootFeatures' ? "quri_squiggle_mc/wee_alloc") "memoryapi")
       [ "minwindef" ]
       [ "ntsecapi" ]
       [ "profileapi" ]
-      (lib.optional (rootFeatures' ? "quri-squiggle-mc/default" || rootFeatures' ? "quri-squiggle-mc/wee_alloc") "synchapi")
-      (lib.optional (rootFeatures' ? "quri-squiggle-mc/default" || rootFeatures' ? "quri-squiggle-mc/wee_alloc") "winbase")
+      (lib.optional (rootFeatures' ? "quri_squiggle_mc/default" || rootFeatures' ? "quri_squiggle_mc/wee_alloc") "synchapi")
+      (lib.optional (rootFeatures' ? "quri_squiggle_mc/default" || rootFeatures' ? "quri_squiggle_mc/wee_alloc") "winbase")
       [ "winnt" ]
     ];
     dependencies = {