[minor] Sometimes page does not load, showing a "loading" message

[elboletaire]

Describe the bug
From time to time, derivepass website does not load, showing a "loading" message in the middle. I need to refresh all the assets removing them from cache (ctrl + shift + r) to get it working again.

To Reproduce
I'm not really sure how to reproduce this... but here's what I usually do:

1. I usually pin the derivepass website, so I always have it loaded when I open firefox.
2. It does not give any kind of problem when it's pinned.
3. From time to time, I unpin it (mostly accidentally), and I think is after that when I get the message.
4. I then close firefox, and when I open it again, if I try to access derivepass, it's in that moment when it shows the 'loading' message.

Expected behavior
To properly load the page, under any case.

Screenshots

Desktop (please complete the following information):

• OS: Any, under desktop
• Browser: Firefox
• Version: happened with, at least, latest 3 versions; currently using 66.0.5

Smartphone (please complete the following information):
Never experienced this under a mobile device.

[indutny]

Looks like an issue with the service worker. Does it print anything to web inspector console?

[elboletaire]

I'll check it the next time it happens to me; as said it does not happen very often, that's why I marked it as minor.

[indutny]

Thank you! You're the best contributor 😀

[elboletaire]

Here's what I can see in the console (note that I opened it after the page was showing the 'loading' message, there may be messages not printed here due to that):

[elboletaire]

I found a way to properly reproduce it:

1. Open derivevpass under firefox and pin the page.
2. Close firefox
3. Open firefox again, and un-pin derivepass.
4. In a new tab, access to derivepass.

I'm always getting the "loading" message if I do these steps (and I can't see more messages in the log apart from those one above).

[indutny]

Gosh, I think service worker might have gotten borked. Sorry!

Try going to about:serviceworkers and unregistering the worker for derivepass.com.

[elboletaire]

Ok, step by step, I was editing my previous message before you posted, so here's what I was adding:

I was gonna edit previous message adding more information:

• Chrome apparently works perfectly.
• Microsoft Edge always shows the "Loading" message, although I guess it does not support service workers maybe?

Gosh, I think service worker might have gotten borked. Sorry!

Try going to about:serviceworkers and unregistering the worker for derivepass.com.

I tried to remove it, but seems to not make any change. In fact, if I remove it, the first time I access to derivepass it shows the "loading" message, so I still need to refresh all assets removing cache.

[elboletaire]

Ok, apparently the Edge error is different. Based on "can I use" I see serviceworkers are supported; therefore I decided to open there the console, and here's what appears under microsoft Edge:

Do you want a different issue for this?

Edit: Apparently yes, are different issues. What is not supported is TextEncoder and TextDecoder: https://caniuse.com/#search=textencoder

[indutny]

Oh gosh! This is different indeed. Could you open one, please?

[elboletaire]

Done in #36