Port in MV3 fix for UBlock Origin: https://github.com/r58Playz/uBlock-mv3

[ttesty]

Prerequisites

• I verified that this is not a filter list issue. Report any issues with filter lists or broken website functionality in the uAssets issue tracker.
• This is NOT a YouTube, Facebook or Twitch report. These sites MUST be reported by clicking their respective links.
• This is not a support issue or a question. For support, questions, or help, visit /r/uBlockOrigin.
• I performed a cursory search of the issue tracker to avoid opening a duplicate issue.
• The issue is not present after disabling uBO in the browser.
• I checked the documentation to understand that the issue I am reporting is not normal behavior.

I tried to reproduce the issue when...

• uBO is the only extension.
• uBO uses default lists and settings.
• using a new, unmodified browser profile.

Description

Port in MV3 fix for UBlock Origin: https://github.com/r58Playz/uBlock-mv3

A specific URL where the issue occurs.

https://github.com/r58Playz/uBlock-mv3

Steps to Reproduce

1. https://github.com/r58Playz/uBlock-mv3
2. Merge into MV3 branch
3. This port consumes twice as much memory (90MB vs 45MB) and wastes CPU on regularly restarting the service worker. Both may be inherent problems in MV3 with complex extensions, i.e. maybe it's unfixable because the platform itself became hostile to complex cases.
   It also requires userScripts API which is only allowed for userscript managers in the webstore

Expected behavior

Run efficiently in MV3.

Troubleshooting information

https://github.com/r58Playz/uBlock-mv3

[gorhill]

See #3713 (comment):

uBO is designed as a memory-resident extension. Using a few tricks to convert it to MV3 without grand rewrite is not the correct approach, it won't be efficient or reliable. uBO Lite was rewritten from the ground up to be efficient and reliable in an MV3 environment where it is assumed it's not permanently loaded in memory.

I also commented as such elsewhere recently specifically regarding https://github.com/r58Playz/uBlock-mv3, but I can't find where.

This port consumes twice as much memory (90MB vs 45MB) and wastes CPU on regularly restarting the service worker.

This is going to cause filtering issues especially for scriptlet-based filters which are meant to be injected before the webpage can execute any of its own JS. A superficial use of the extension might seem to work just fine but in the long run I expect tons of filtering issues arising from it, let alone the inefficiency of having to reload all the filters every time the service worker wakes up.

Both may be inherent problems in MV3 with complex extensions, i.e. maybe it's unfixable because the platform itself became hostile to complex cases.

uBO Lite was designed to not have issue with being suspended, and it actually works even more reliably than uBO MV2 regarding scriptlet-based filters -- including at browser launch, this was not possible to solve with MV2 framework.

uBO Lite's service worker wakes up only when needed, and it's designed to be as lean as possible, it typically hovers below 25 MB (on my side) when it wakes up from listened events. Webpages which do not required to have cosmetic- or scriptlet-based filtering applied won't cause the service worker to wake up at all.

In any case, uBO MV2 is still available in Firefox, no trickery required, and once I drop support for Chromium in uBO MV2 in some distant future, I plan a good cleanup of the code base to remove all the complexity that accumulated over the years as a result of supporting MV2 platforms with often different behavior in the APIs.

[gorhill]

Also, the steps to install requires changing root-owned files, so only a handful of people would mind doing this, while I prefer to do work which benefits a majority of users, especially the ones who are least technically minded, which is the majority.

[krystian3w]

I only remember this answer #3690 (reply in thread) (if the link doesn't load, it's above the comment MasterKia).

It's a bit of a bummer that the issues section in the fork doesn't help or has disappeared.

https://github.com/r58Playz/uBlock-mv3/issues
https://github.com/r58Playz/uBlock-mv3/issues/new/choose