remove-cache-storage-item scriptlet doesn't seem to be recognized in filter rules

[JoviDong]

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.
• 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.
• using a new, unmodified browser profile.

Description

Just a quick heads-up! I was experimenting with the remove-cache-storage-item scriptlet and noticed uBO might not be able to access or recognize it.

I was looking at the source code here: localstorage.js#L132.

A specific URL where the issue occurs.

https://example.com (This happens anywhere).

Steps to Reproduce

1. Add this to your filters: example.com##+js(remove-cache-storage-item)

Expected behavior

uBO recognizes the scriptlet and injects it.

Actual behavior

The scriptlet doesn't seem to be found or injected.

Configuration

Details

uBlock Origin: 1.74.1b2
Firefox: 157
filterset (summary):
 network: 0
 cosmetic: 0
 scriptlet: 0
 html: 0
listset (total-discarded, last-updated):
 removed:
  ublock-filters: null
  ublock-badware: null
  ublock-privacy: null
  ublock-unbreak: null
  ublock-quick-fixes: null
  easylist: null
  easyprivacy: null
  urlhaus-1: null
  plowe-0: null
 default:
  user-filters: 0-0, never
filterset (user): [empty]
switchRuleset:
 added: [array of 6 redacted]
hostRuleset:
 added: [array of 599 redacted]
userSettings:
 advancedUserEnabled: true
 cloudStorageEnabled: true
 cnameUncloakEnabled: false
 userFiltersTrusted: true
hiddenSettings:
 allowGenericProceduralFilters: true
 extensionUpdateForceReload: true
 filterAuthorMode: true
 trustedListPrefixes: ublock- user- https://raw.githubusercontent.com/JoviDong/
 updateAssetBypassBrowserCache: true
supportStats:
 allReadyAfter: 243 ms (selfie)
 maxAssetCacheWait: 16 ms
 cacheBackend: indexedDB

[gorhill]

Looks like I changed .js to .fn in a past commit, possibly to prevent the scriptlet from being used while keeping the code around. I will just remove the scriptlet.

The scriptlet was added in this commit, and I can't remember why, but I suspect it might have been as an attempt to deal with lots of Youtube changes at the time.

[JoviDong]

Looks like I changed .js to .fn in a past commit, possibly to prevent the scriptlet from being used while keeping the code around. I will just remove the scriptlet.

The scriptlet was added in this commit, and I can't remember why, but I suspect it might have been as an attempt to deal with lots of Youtube changes at the time.

Got it, that makes total sense!

I was just experimenting with it to clear some cache on v.qq.com, but I'll see if I can find another workaround for that site.

Feel free to close this whenever. Thanks for taking a look!

[gorhill]

to clear some cache on v.qq.com

What was the ultimate goal of clearing specific cache items?

[stephenhawk8054]

For clearing local storage item, we can use set-local-storage-item with $remove$. We have some filters like that in our lists already.

[gorhill]

The scriptlet is for cache storage items though, not local/session storage items.

[JoviDong]

The main goal for clearing specific cache items was to deal with cases where sites (e.g., v.qq.com) have started using CacheStorage to cache tracking and ad scripts. Even when uBlock Origin blocks the network requests for those scripts, they may can still be loaded from the cache and executed, effectively bypassing the filters. Being able to remove those cached entries via a scriptlet would help close that loophole. Thanks again for your time and all your work on uBlock Origin!

[krystian3w]

set-local-storage-item with $remove$

Perhaps we could make a session version?

set-session-storage-item with $remove$