Differential update of filter lists, as a result of discussions at <https://github.com/AdguardTeam/FiltersCompiler/issues/192>. Resulting spec is [here](https://github.com/ameshkov/diffupdates).
The goal is to **NOT** be ranked among the "most popular projects" by bandwidth usage (as per [jsDelivr's public stats](https://www.jsdelivr.com/statistics)):
It is expected that differential updates will lower both requests and bandwidth usage.
To benefit the much shorter update period enabled by differential updates, you must let uBO auto-update the filter lists. Forcing a manual update will prevent differential updates until the next time a list auto-update.
## Fixes / changes
- [Have `urltransform=` use the same syntax as `replace=`](https://github.com/gorhill/uBlock/commit/d7c99b46e6)
- [Implement network filter option `replace=`](https://github.com/gorhill/uBlock/commit/7c3e060c01) (Firefox only because [filterResponseData](https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/webRequest/filterResponseData#browser_compatibility))
- [Prevent evaluating the SNFE until fully loaded](https://github.com/gorhill/uBlock/commit/89b272775a)
- [Add support for differential update of filter lists](https://github.com/gorhill/uBlock/commit/d05ff8ffeb)
