* * 3p block is being less specific than addons.mozilla.org * image noop

The cell at addons.mozilla.org * 3p evaluates to block.

If this really confuses a majority of users, I will just remove the ability to create block rules for images. The primary purpose of image rules was to save bandwidth, while more recent versions of uBO can block images based on size.

If it really confuse a majority of users, I will just remove the ability to create block rules for images.

I guess that is not really required though it would be nice to add/update examples at:
https://github.com/gorhill/uBlock/wiki/Dynamic-filtering:-precedence

For example:
What is that?

The more specific the party, the higher the precedence.

• example.com overrides 1rd-party scripts

Is that 1st-party scripts or 3rd-party scripts?

Also a statement:

All cells override the all cells.

implies that a below dynamic filter rule would not work?

* * 3p block
addons.mozilla.org * * noop

This one is confusing too since it is present in the rules but does not work.

Edit:
https://github.com/gorhill/uBlock/wiki/Behind-the-scene-network-requests

If there are only very specific behind-the-scene network requests you would like to filter, a good approach to minimize potential problems is to use dynamic filtering: set a local rule for the all cell to allow (green) (i.e. behind-the-scene * * allow). This will ensure nothing is blocked in the behind-the-scene scope, just as if uBlock is disabled for that scope. Then create block rules for the specific hostnames for which you want to block all network requests, or noop if you want to subject those hostnames to static filtering only.

It seems 3p overrides that too?

* * 3p block
behind-the-scene * * allow

Still blocks behind-the-scene requests. Despite:

This will ensure nothing is blocked in the behind-the-scene scope, just as if uBlock is disabled for that scope.

I have a similar/the same problem. I left a Medium article open, and noticed uBlock blocked ~300k requests, so I investigated. Turns out that the webpage connects to collector-medium.lightstep.com periodically, EasyPrivacy blocks that, and since lightstep seems just performance monitoring, I tried to re-enable it.

First I tried various dynamic rules, ending up with the following permanent dynamic rule:

* collector-medium.lightstep.com * allow

The docs seem pretty clear this rule should override the static ones, but that doesn't work.
EDIT: the static filter rule from EasyPrivacy is:

||collector-medium.lightstep.com^

The docs seem pretty clear this rule should override the static ones

Your rule works fine here. Did you enable Advanced user mode?

@gorhill You're right, I didn't and that fixed it, but the UI/docs doesn't tell me to in places I looked at.

The "My rules" settings page is shown without that enabled, and neither that settings page nor the page linked at "full documentation" (https://github.com/gorhill/uBlock/wiki/Dynamic-filtering:-rule-syntax) dynamic page mentions it. (I didn't find an edit button for the wiki, so I'm afraid some contributor will have to fix it). Would you like a separate issue for that?

Would you like a separate issue for that?

No. This is a sub page on the whole topic -- go back to the main page and it's clearly mentioned.

Could I then suggest linking to https://github.com/gorhill/uBlock/wiki/Dynamic-filtering instead?

(I'd also say the Dynamic filtering page should at least have a warning if it's disabled, to be a bit more usable, but changing the link is easier and would make things much better).

Could I then suggest linking to https://github.com/gorhill/uBlock/wiki/Dynamic-filtering instead?

It does already link back, that's what I pointed out in my answer above.

Ok I see, you mean from the dashboard of uBO itself.