diff --git a/krebs/5pkgs/simple/TabFS/default.nix b/krebs/5pkgs/simple/TabFS/default.nix
new file mode 100644
index 000000000..23fdf519d
--- /dev/null
+++ b/krebs/5pkgs/simple/TabFS/default.nix
@@ -0,0 +1,100 @@
+{ lib, pkgs, stdenv }:
+
+stdenv.mkDerivation rec {
+  name = "TabFS";
+
+  src = pkgs.fetchgit {
+    url = https://cgit.krebsco.de/TabFS;
+    rev = "1fc4845283a0e6aa46a8d8978f356d5ccdcedd13";
+    sha256 = "0bsm5fhxrr6zwbnm9p10h9pwm85llr02g2ch97a62r62dhjjrc8h";
+  };
+
+  phases = [
+    "unpackPhase"
+    "buildPhase"
+    "installPhase"
+  ];
+
+  nativeBuildInputs = [
+    pkgs.jq
+  ];
+
+  buildInputs = [
+    pkgs.fuse
+  ];
+
+  buildPhase = ''
+    make -C fs
+  '';
+
+  installPhase = ''
+    mkdir -p $out/bin
+
+    cp fs/tabfs $out/bin
+
+    ${lib.concatStrings
+      (lib.mapAttrsToList
+        (name: spec: /* sh */ ''
+          jq < ${spec.source} > $out/bin/${name} \
+          --arg out $out \
+          --arg path ${lib.makeBinPath spec.path} \
+          -Rrs \
+          ${lib.escapeShellArg /* jq */ ''
+            def when(cond; update): if cond then update else . end;
+
+            split("\n") |
+            map(${lib.concatMapStringsSep "|" (filter: "(${filter})")
+              (lib.toList (spec.filter or []) ++ [
+                /* jq */ ''when(test("^#!"); "\(.)\nexport PATH=\($path)")''
+              ])
+            }) |
+            join("\n")
+          ''}
+          chmod +x $out/bin/${name}
+        '')
+        {
+          tabfs-enable-native-messaging = {
+            source = "install.sh";
+            path = [
+              pkgs.coreutils
+            ];
+            filter = /* jq */''
+              when(test("^EXE_PATH="); "EXE_PATH=\($out)/bin/tabfs-wrapper")
+            '';
+          };
+          tabfs-wrapper = {
+            source = "fs/tabfs-wrapper";
+            path = [
+              pkgs.coreutils
+              pkgs.findutils
+              pkgs.gnugrep
+              pkgs.procps
+              "/run/wrappers" # for fusermount
+            ];
+          };
+          tabfs-build-crx = {
+            source = "build-crx.sh";
+            path = [
+              pkgs.coreutils
+              pkgs.crx
+              pkgs.gnugrep
+              pkgs.jq
+              pkgs.openssl
+            ];
+            filter = /* jq */''
+              when(test("^source_dir=");
+                sub("\\$\\(dirname \"\\$0\"\\)"; ${builtins.toJSON src})
+              )
+            '';
+          };
+          tabfs-install-crx = {
+            source = "install-crx.sh";
+            path = [
+              pkgs.coreutils
+            ];
+          };
+        }
+      )
+    }
+  '';
+}
diff --git a/krebs/5pkgs/simple/crx/default.nix b/krebs/5pkgs/simple/crx/default.nix
new file mode 100644
index 000000000..429a471df
--- /dev/null
+++ b/krebs/5pkgs/simple/crx/default.nix
@@ -0,0 +1,50 @@
+{ lib, pkgs, stdenv }:
+
+stdenv.mkDerivation rec {
+  pname = "crx";
+  version = "1.1.0";
+
+  src = pkgs.fetchgit {
+    url = https://cgit.krebsco.de/crx;
+    rev = "refs/tags/v${version}";
+    sha256 = "10xwrdxwbvqydayg6a4jcl3cfp4wi9ssm7a0dlnclkc4rmf6sv4a";
+  };
+
+  phases = [
+    "unpackPhase"
+    "installPhase"
+  ];
+
+  installPhase = ''
+    mkdir -p $out/bin
+
+    ${lib.concatStrings
+      (lib.mapAttrsToList
+        (name: path: /* sh */ ''
+          sed \
+            's,^set -efu$,&\nPATH=${lib.makeBinPath path}; export PATH,' \
+            < ./${name} \
+            > $out/bin/${name}
+          chmod +x $out/bin/${name}
+        '')
+        {
+          crxid = [
+            pkgs.bc
+            pkgs.coreutils
+            pkgs.file
+            pkgs.gnused
+            pkgs.openssl
+            pkgs.xxd
+          ];
+          crxmake = [
+            pkgs.coreutils
+            pkgs.gnused
+            pkgs.openssl
+            pkgs.xxd
+            pkgs.zip
+          ];
+        }
+      )
+    }
+  '';
+}
diff --git a/tv/2configs/gitrepos.nix b/tv/2configs/gitrepos.nix
index 991281ede..5b6a70b27 100644
--- a/tv/2configs/gitrepos.nix
+++ b/tv/2configs/gitrepos.nix
@@ -65,6 +65,9 @@ let {
 
   public-repos = mapAttrs make-public-repo ({
   } // mapAttrs (_: recursiveUpdate { cgit.section = "1. miscellaneous"; }) {
+    crx = {
+      cgit.desc = "utilities for working with Chrome extensions";
+    };
     dic = {
       cgit.desc = "dict.leo.org command line interface";
     };
@@ -102,6 +105,9 @@ let {
     stockholm = {
       cgit.desc = "NixOS configuration";
     };
+    TabFS = {
+      cgit.desc = "mount browser tabs & co. as a filesystem";
+    };
     with-ssh = {};
   } // mapAttrs (_: recursiveUpdate { cgit.section = "2. Host configurations"; }) {
     ni = {