alt Hacker News> content can load without the blocker being ready to filter
This isn't an MV3 issue, it's a Chromium design decision that extensions cannot block browser initialization. It was also true with MV2. In fact, MV3 has improved the situation because DNR rules are enforced immediately.
You could certainly argue that Chrome should allow extensions to block browser initialization, or that it should be user configurable - but it seems like an entirely defensible Chrome decision. Regardless, it's nothing to do with MV3.
> the filter rules aren't as flexible.
That's true, but they are still very flexible, and DNR makes some very nice features possible in uBO lite that were not possible in uBO.
For example, did you know that you can change your User-Agent with uBO lite? Go to the Custom DNR rules tab, and enter something like this to pretend to be Lynx on whatever.com:
id: 5
priority: 100
action:
type: modifyHeaders
requestHeaders:
- header: User-Agent
operation: set
value: Lynx/2.9.2 libwww-FM/2.14 SSL-MM/1.4.1 OpenSSL/3.5.7
condition:
requestDomains:
- whatever.com
resourceTypes:
- main_frame
Any MV3 issue could probably be summed up as "MV3 isn't so bad, just the implementation in Chrome" where Chrome defines MV3 (as it's not a W3C standard) and ships it as such.
That said,
> Chromium design decision that extensions cannot block browser initialization
It's not "browser initialization" that was blocked, it was blocking network requests for pages until they were processed by all components in the chain. Notably, this could never apply applied to the browser or its internal pages itself.
> It was also true with MV2.
With MV2 you used the blocking version of https://developer.chrome.com/docs/extensions/reference/api/w... which no longer works with MV3 extensions in Chrome and then the request had to wait until it was given to and processed by the blocker.
Firefox is a great example about all of the above points: MV3 still supports blockingWebRequest there, so it gets the best of both worlds.
> did you know that you can change your User-Agent with uBO lite?
With MV2 you'd use blocking webRequest and chrome.webRequest.onBeforeSendHenders. I'm not sure uBO ever bothered with this before uBO Lite, but it's a bit of a double standard to say "MV2 didn't offer blocking requests, that was a different API which happ