Manifest3: "background.js:1 Uncaught (in promise) Error: Could not establish connection. Receiving end does not exist."

[TheRealMiRRoRMaN]

background.js:1 Uncaught (in promise) Error: Could not establish connection. Receiving end does not exist.
background.js:1 Uncaught (in promise) Error: Could not establish connection. Receiving end does not exist.
background.js:1 Uncaught (in promise) Error: Could not establish connection. Receiving end does not exist.
background.js:1 Uncaught (in promise) Error: Could not establish connection. Receiving end does not exist.
background.js:1 Uncaught (in promise) Error: Could not establish connection. Receiving end does not exist.
background.js:1 Uncaught (in promise) Error: Could not establish connection. Receiving end does not exist.
background.js:1 Uncaught (in promise) Error: Could not establish connection. Receiving end does not exist.
background.js:1 Uncaught (in promise) Error: Could not establish connection. Receiving end does not exist.
background.js:1 Uncaught (in promise) Error: Could not establish connection. Receiving end does not exist.
background.js:1 Uncaught (in promise) Error: Could not establish connection. Receiving end does not exist.
background.js:1 Uncaught (in promise) Error: Could not establish connection. Receiving end does not exist.
background.js:1 Uncaught (in promise) Error: Could not establish connection. Receiving end does not exist.

1. Bug Report:

• BUG:
  • Browser:
  • HOW:
• Did YouTube change?
  • Or did our last update start the bug? Then Are any Browser errors shown? F12-key : console)
• Does the bug not happen when you log out of YouTube? Then please copy your experiment flags list with & without the error, so we can compare: Enter: ´yt.config_.EXPERIMENT_FLAGS´ into the Browser console on youtube (F12-Key). (can also copy them from the html source(ctrl+U))

STEP-0: (before submitting)

Thanks for coming & caring! Sometime 3 words are enough of a bug report. But please check if the issue has already been reported ever. That might inspire you to post different words there.
(With GitHub's issue search (use this link) (else removing "is:issue is:open" from the standard search)

More:

• *Expected /preferred behavior:

• ImprovedTube Version:

• Tested alone without other YouTube extensions or in incognito mode?

• My Settings:

• DOM:

  or paste collapsed:

  
  here (How-To: https://github.com/code-charity/youtube/wiki/Contributing#Test )

• OS:

• Device:

[ImprovedTube]

Because of Manifest3...
hi! & thanks @TheRealMiRRoRMaN Chrome Browser?

[TheRealMiRRoRMaN]

Because of Manifest3... hi! & thanks @TheRealMiRRoRMaN Chrome Browser?

Its a Vivaldi browser which is chrome based, on windows 10

[TheRealMiRRoRMaN]

it went good yesterday but i dunno if you guys changed anything now i get an error again

Uncaught (in promise) Error: Could not establish connection. Receiving end does not exist.

[raszpl]

partial fix #2356

its caused by extension spamming discarded tabs and tabs it has no permissions for

[raszpl]

partially, bad behavior is still there

1860 Uncaught (in promise) Error: Could not establish connection. Receiving end does not exist.

FOCUS/BLUR still needs fixing