add Opera, Vivaldi, and Ungoogled Chromium support for Linux

README.md

@@ -9,7 +9,7 @@ Adds a shortcut for running [JupyterLab](https://jupyter.org/) in a Chromium-bas
 * A Chromium-based browser
   * On Windows, [Google Chrome](https://www.google.com/chrome/), [Brave](https://brave.com/), and [Microsoft Edge](https://www.microsoft.com/en-us/edge) are supported. Preference will be given to your default browser, if it appears to be a Chromium-based browser, or to the first one of these browsers found.  Microsoft Edge is guaranteed to be installed on Windows 10+ and is a fall-back if no other supported browser is found.
   * On MacOS, [Google Chrome](https://www.google.com/chrome/), [Microsoft Edge](https://www.microsoft.com/en-us/edge), [Brave](https://brave.com/), and [Chromium](https://www.chromium.org/getting-involved/download-chromium/) are preferred in that order.
-  * On Linux, [Google Chrome](https://flathub.org/apps/com.google.Chrome), [Microsoft Edge](https://flathub.org/apps/com.microsoft.Edge), [Brave](https://flathub.org/apps/com.brave.Browser), and [Chromium](https://flathub.org/apps/org.chromium.Chromium) are supported and preferred in that order. If [flatpak](https://flatpak.org/) is installed and one of these browsers is installed with Flatpak (recommended), it will be preferred over any snap-installed or package manager-installed versions of any of these browsers.
+  * On Linux, [Google Chrome](https://flathub.org/apps/com.google.Chrome), [Microsoft Edge](https://flathub.org/apps/com.microsoft.Edge), [Brave](https://flathub.org/apps/com.brave.Browser), [Opera](https://flathub.org/apps/com.opera.Opera), [Vivaldi](https://flathub.org/apps/com.vivaldi.Vivaldi), [Ungoogled Chromium](https://flathub.org/apps/io.github.ungoogled_software.ungoogled_chromium), and [Chromium](https://flathub.org/apps/org.chromium.Chromium) are supported and preferred in that order. If [flatpak](https://flatpak.org/) is installed and one of these browsers is installed with Flatpak (recommended), it will be preferred over any snap-installed or package manager-installed versions of any of these browsers.
 
 ## Setup
 

jupyter_lab_config.py

@@ -22,7 +22,15 @@ def find_flatpak_browser():
         # flatpak is not installed
         return
 
-    flatpak_apps = ("com.google.Chrome", "com.microsoft.Edge", "com.brave.Browser", "org.chromium.Chromium")
+    flatpak_apps = (
+        "com.google.Chrome",
+        "com.microsoft.Edge",
+        "com.brave.Browser",
+        "com.opera.Opera",
+        "com.vivaldi.Vivaldi",
+        "io.github.ungoogled_software.ungoogled_chromium",
+        "org.chromium.Chromium",
+    )
 
     try:
         flatpak_process = run(
@@ -71,7 +79,15 @@ def find_browser():
 
     elif platform.system() == "Linux":
         # prefers Google Chrome on Linux due to popularity of the browser
-        cmds = ("google-chrome", "microsoft-edge", "brave", "chromium")
+        cmds = (
+            "google-chrome", 
+            "microsoft-edge", 
+            "brave", 
+            "opera", 
+            "vivaldi", 
+            "ungoogled-chromium", 
+            "chromium",
+        )
         path_elements = map(Path, environ["PATH"].split(":"))
 
     elif platform.system() == "Darwin":