Unable to Install on PopOS 20.04

[jeremyakers]

I'm trying to install the system monitor applet. I've tried installing via both Chrome (109.0.5414.74) and Firefox (108.0.2)
First thing I notice both browsers show this warning even before I attempted to install:

In an attempt to resolve this, before even installing: I check the docs at the specified link which say to install gnome-chrome-shell:
https://wiki.gnome.org/action/show/Projects/GnomeShellIntegration/Installation?action=show&redirect=Projects%2FGnomeShellIntegrationForChrome%2FInstallation#Ubuntu_Linux
Like so:

Which I already had installed:

$ dpkg -l chrome-gnome-shell
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name               Version      Architecture Description
+++-==================-============-============-===================================================
ii  chrome-gnome-shell 10.1-5       all          GNOME Shell extensions integration for web browsers

I have the browser plugin installed for both Chrome and Firefox:

So since I seem to have all the required components installed: I went ahead and tried to install the system-monitor extension. Firefox prompts me for permission to install, which I grant, and it just says "ERROR":

If I refresh the page it adds the button to configure the extension:

I'm able to open the preferences / configuration GUI:

Running gnome-extensions info/show just shows:

$ gnome-extensions show [email protected]
[email protected]
  Name: system-monitor
  Description: Display system information in GNOME Shell status bar, such as memory, CPU, disk and battery usages, network rates…
  Path: /home/jeremy/.local/share/gnome-shell/extensions/[email protected]
  URL: https://github.com/paradoxxxzero/gnome-shell-system-monitor-applet
  Version: 40
  State: ERROR
$ gnome-extensions info [email protected]
[email protected]
  Name: system-monitor
  Description: Display system information in GNOME Shell status bar, such as memory, CPU, disk and battery usages, network rates…
  Path: /home/jeremy/.local/share/gnome-shell/extensions/[email protected]
  URL: https://github.com/paradoxxxzero/gnome-shell-system-monitor-applet
  Version: 40
  State: ERROR

I have the pre-reqs installed:

$ sudo apt install gir1.2-gtop-2.0 gir1.2-nm-1.0 gir1.2-clutter-1.0 gnome-system-monitor
Reading package lists... Done
Building dependency tree       
Reading state information... Done
gir1.2-clutter-1.0 is already the newest version (1.26.4+dfsg-1).
gir1.2-gtop-2.0 is already the newest version (2.40.0-2).
gir1.2-nm-1.0 is already the newest version (1.22.10-1ubuntu2.3).
gnome-system-monitor is already the newest version (3.36.1-0ubuntu0.20.04.1).

I also tried downloading the ZIP and installing/enabling via gnome-extensions CLI.

I'm lost as to how to troubleshoot this any further. How do I access an actual log/stacktrace/etc for why the extension is failing to load?

System info:

EDIT: I installed gnome-shell-extensions-manager and that gave me access to the underlying error message:
Error: Tried to construct an object without a GType; are you using GObject.registerClass() when inheriting from a GObject type?

[jeremyakers]

Updated to add:
I installed gnome-shell-extensions-manager and that gave me access to the underlying error message:
Error: Tried to construct an object without a GType; are you using GObject.registerClass() when inheriting from a GObject type?

[jeremyakers]

After installing gnome-shell-extensions-manager, and using that to finally get at the true underlying error message: I searched the issues here on github and found the solution:

Alt-F2 then r

This reloaded gnome-shell and fixed it for me.

[ZimbiX]

I'm glad you figured that out. To see error logging:

journalctl -f /usr/bin/gnome-shell /usr/bin/gjs

For more up-to-date Gnome Shell versions, you'd need to instead install system-monitor-next due to delays from the current maintainers of this repo

[ZimbiX]

I think this issue can be closed now. Needing to reload after installing is common to many Gnome extensions. I don't yet know why it's the case here. If it's going to be addressed, there should be an issue dedicated to that, if it's still a problem with system-monitor-next.

[ZimbiX]

Oh, and I haven't seen that warning before. Maybe it's because your distro's Gnome packages are older than what the website / browser extension is expecting...

[jeremyakers]

Yeah I guess my only feedback would be to add a step in the documentation that says reloading may be necessary (And explain how). I've personally never had to reload for any other extensions I've installed, and even though I've been a GNOME user for many, many years I did not even know about that reload command.

I think it's fine that reload may be necessary, but a user may not know that it's necessary nor how to do it.