diff --git a/.binder/environment.yml b/.binder/environment.yml
index 6565cb54..8fb937b4 100644
--- a/.binder/environment.yml
+++ b/.binder/environment.yml
@@ -22,7 +22,6 @@ channels:
 dependencies:
   - python >=3.9
   # demo toys
-  - bqplot
   - graphviz2drawio
   - jupyter-lsp-python-lsp-server
   - jupyterlab-link-share
@@ -37,11 +36,16 @@ dependencies:
   - segno
   - shapely
   - tabulate
+  - sphinx-autobuild
+  ### FEDERATED EXTENSIONS ###
+  - bqplot
+  - jupyterlab_widgets
+  - jupyterlab-tour
   - wxyz_datagrid
   - wxyz_json_schema_form
   - wxyz_lab
   - wxyz_svg
-  - sphinx-autobuild
+  ### FEDERATED EXTENSIONS ###
   ############################################################################
   ### ipydrawio-docs-deps ###
 
@@ -51,8 +55,6 @@ dependencies:
   - sphinx
   - sphinx-jsonschema
   - sphinxext-rediraffe
-  # for lite
-  - jupyterlab-tour
   # TODO: resolve upstream
   - sqlalchemy <1.4
   - pip:
diff --git a/.gitignore b/.gitignore
index dba6dc40..e3d296a2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 __pycache__
 _output
+.cache/
 .coverage*
 .eslintcache
 .ipynb_checkpoints
diff --git a/demo/jupyter-lite.json b/demo/jupyter-lite.json
index ad3afc05..3a3b8673 100644
--- a/demo/jupyter-lite.json
+++ b/demo/jupyter-lite.json
@@ -1,14 +1,7 @@
 {
   "jupyter-config-data": {
     "appName": "IPyDrawioLite",
-    "disabledExtensions": [
-      "@deathbeds/ipydrawio-pdf",
-      "@jupyterlab-classic/lab-extension",
-      "@jupyterlab/server-proxy",
-      "@krassowski/jupyterlab-lsp",
-      "jupyterlab-server-proxy",
-      "nbdime-jupyterlab"
-    ],
+    "collaborative": true,
     "faviconUrl": "./favicon.ico"
   },
   "jupyter-lite-schema-version": 0
diff --git a/demo/jupyter_lite_config.json b/demo/jupyter_lite_config.json
index 4b63a55d..b747c55d 100644
--- a/demo/jupyter_lite_config.json
+++ b/demo/jupyter_lite_config.json
@@ -2,9 +2,20 @@
   "LiteBuildConfig": {
     "apps": ["lab"],
     "contents": ["."],
+    "federated_extensions": [
+      "../py_packages/ipydrawio/dist/ipydrawio-1.1.1-py3-none-any.whl",
+      "https://github.com/conda-forge/releases/releases/download/noarch/bqplot-0.12.30-pyhd8ed1ab_0.tar.bz2/bqplot-0.12.30-pyhd8ed1ab_0.tar.bz2",
+      "https://github.com/conda-forge/releases/releases/download/noarch/jupyterlab-tour-3.1.2-pyhd8ed1ab_0.tar.bz2/jupyterlab-tour-3.1.2-pyhd8ed1ab_0.tar.bz2",
+      "https://github.com/conda-forge/releases/releases/download/noarch/jupyterlab_widgets-1.0.0-pyhd8ed1ab_1.tar.bz2/jupyterlab_widgets-1.0.0-pyhd8ed1ab_1.tar.bz2",
+      "https://github.com/conda-forge/releases/releases/download/noarch/wxyz_datagrid-0.5.1-pyhd8ed1ab_0.tar.bz2/wxyz_datagrid-0.5.1-pyhd8ed1ab_0.tar.bz2",
+      "https://github.com/conda-forge/releases/releases/download/noarch/wxyz_json_schema_form-0.5.1-pyhd8ed1ab_0.tar.bz2/wxyz_json_schema_form-0.5.1-pyhd8ed1ab_0.tar.bz2",
+      "https://github.com/conda-forge/releases/releases/download/noarch/wxyz_lab-0.5.1-pyhd8ed1ab_0.tar.bz2/wxyz_lab-0.5.1-pyhd8ed1ab_0.tar.bz2",
+      "https://github.com/conda-forge/releases/releases/download/noarch/wxyz_svg-0.5.1-pyhd8ed1ab_0.tar.bz2/wxyz_svg-0.5.1-pyhd8ed1ab_0.tar.bz2"
+    ],
     "ignore_contents": [
       "(lab/|_output|.gitignore|doit.db|\\.json$|jupyter_config|log$|\\.cache)"
     ],
+    "ignore_sys_prefix": true,
     "lite_dir": ".",
     "output_archive": "../build/demo/ipydrawio-lite-1.1.1.tgz",
     "output_dir": "../build/demo"
diff --git a/docs/_templates/demo.html b/docs/_templates/demo.html
index 1b5e0f80..a5a9df70 100644
--- a/docs/_templates/demo.html
+++ b/docs/_templates/demo.html
@@ -6,10 +6,16 @@
     data-toggle="tooltip"
     data-placement="right"
     title="Try IPyDrawio in your browser. Right now."
+    id="demo-room-button"
   >
     <i class="fas fa-lightbulb"></i>
-    Try <strong>IPyDrawio</strong> Now
+    Try <strong>IPyDrawio</strong> Now <span id="demo-room-label"></span>
   </a>
+  <details>
+    <summary><i class="fas fa-users"></i>Collaboration...</summary>
+    <input type="text" placeholder="room name" id="demo-room-name"></input><br/>
+    <em>everyone who uses this room name will be able to edit all files</em>
+  </details>
   <br/>
   or <a
     href="{{ pathto(demo_tarball, True) }}"
@@ -22,5 +28,15 @@
   </a>
   <hr/>
   <em>Powered by <a href="https://jupyterlite.rtfd.io" target="_blank">JupyterLite</a></em>
-  <script>$(function() {$('[data-toggle="tooltip"]').tooltip();});</script>
+  <script>$(function() {
+    $('[data-toggle="tooltip"]').tooltip();
+    $("#demo-room-name").on('input', () => {
+      const room = $("#demo-room-name").val().trim();
+      $("#demo-room-button").attr(
+        "href",
+        `{{ pathto('demo/index') }}` + (room ? `?room=${room}` : '')
+      );
+      $("#demo-room-label").text(room ? ` with ${room}` : '');
+    });
+  });</script>
 </div>
diff --git a/docs/environment.yml b/docs/environment.yml
index b667b595..d87dda38 100644
--- a/docs/environment.yml
+++ b/docs/environment.yml
@@ -29,8 +29,6 @@ dependencies:
   - sphinx
   - sphinx-jsonschema
   - sphinxext-rediraffe
-  # for lite
-  - jupyterlab-tour
   # TODO: resolve upstream
   - sqlalchemy <1.4
   - pip:
diff --git a/dodo.py b/dodo.py
index f90c7e3d..63867b1e 100644
--- a/dodo.py
+++ b/dodo.py
@@ -86,6 +86,9 @@ def task_dist():
 
 def task_env():
     """sync environments"""
+    if P.RTD:
+        return
+
     for env, inherits in P.ENV_INHERITS.items():
         yield dict(
             name=f"""{env.parent.name}:{':'.join([inh.parent.name for inh in inherits])}""",
@@ -677,6 +680,24 @@ def task_demo():
         print("jupyterlite not found, this might be okay", flush=True)
         return
 
+    yield dict(
+        name="extensions",
+        doc="update jupyter-lite.json from the conda env",
+        file_dep=[P.ENV_BINDER, P.PY_WHEEL[P.IPD.name]],
+        targets=[P.DEMO_CONFIG],
+        actions=[
+            (
+                P._sync_lite_config,
+                [
+                    P.ENV_BINDER,
+                    P.DEMO_CONFIG,
+                    P.FED_EXT_MARKER,
+                    [P.PY_WHEEL[P.IPD.name]],
+                ],
+            )
+        ],
+    )
+
     demo_dest = []
     demo_tasks = []
     final_dest = []
diff --git a/scripts/project.py b/scripts/project.py
index 491c156d..d08bb94b 100644
--- a/scripts/project.py
+++ b/scripts/project.py
@@ -91,6 +91,8 @@ def _clean(*paths_or_globs):
 TESTING_IN_CI = bool(json.loads(os.environ.get("TESTING_IN_CI", "0")))
 CI_ARTIFACT = os.environ.get("CI_ARTIFACT", "wheel")
 CI = bool(json.loads(os.environ.get("CI", "0")))
+RTD = os.environ.get("READTHEDOCS", "build")
+
 
 # test arg pass-throughs
 ATEST_ARGS = json.loads(os.environ.get("ATEST_ARGS", "[]"))
@@ -331,6 +333,9 @@ def _norm_js_version(pkg):
 }
 
 # demo
+RE_CONDA_FORGE_URL = r"/conda-forge/(.*/)?(noarch|linux-64|win-64|osx-64)/([^/]+)$"
+CONDA_FORGE_RELEASE = "https://github.com/conda-forge/releases/releases/download"
+FED_EXT_MARKER = "### FEDERATED EXTENSIONS ###"
 DEMO = ROOT / "demo"
 DEMO_CONFIG = DEMO / "jupyter_lite_config.json"
 DEMO_APPS = ["lab"]
@@ -806,6 +811,35 @@ def _build_lite():
         return False
 
 
+def _sync_lite_config(from_env, to_json, marker, extras):
+    """use conda list to derive tarball names"""
+    raw_lock = subprocess.check_output(["conda", "list", "--explicit"])
+    ext_packages = [
+        p.strip().split(" ")[0]
+        for p in from_env.read_text(encoding="utf-8").split(marker)[1].split(" - ")
+        if p.strip()
+    ]
+
+    tarball_urls = ["../" + str(extra.relative_to(ROOT).as_posix()) for extra in extras]
+    for raw_url in sorted(raw_lock.decode("utf-8").splitlines()):
+        try:
+            label, subdir, pkg = re.findall(RE_CONDA_FORGE_URL, raw_url)[0]
+        except IndexError:
+            continue
+
+        if label:
+            # TODO: haven't looked into this
+            continue
+
+        for ext in ext_packages:
+            if pkg.startswith(ext):
+                tarball_urls += ["/".join([CONDA_FORGE_RELEASE, subdir, pkg, pkg])]
+
+    config = json.loads(to_json.read_text(encoding="utf-8"))
+    config["LiteBuildConfig"]["federated_extensions"] = sorted(tarball_urls)
+    to_json.write_text(json.dumps(config, indent=2, sort_keys=True))
+
+
 # Late environment hacks
 os.environ.update(
     CONDARC=str(CONDARC),