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Created Firefox webext (markdown)

Raymond Hill 2017-07-24 08:25:25 -04:00
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The webext (-hybrid) version of uBO ("uBO/webext") has been released to the [dev channel on AMO](https://addons.mozilla.org/en-US/firefox/addon/ublock-origin/versions/beta) starting with 1.13.9b0.
### First install
The first time uBO/webext executes, there might be a noticeable delay (a few seconds): this is caused by the fact that uBO/webext will import all the data from legacy storage, into webext storage. This is done only the first time the uBO/webext is executed, after this the import step will be skipped.
If you subsequently remove uBO/webext, this will cause the webext storage to be removed by Firefox, and upon re-installing uBO/webext version, the import code will again kick in.
Note that uBO/webext will still be labelled as "Legacy" in `about:addons`, because uBO/webext is really a [webext-hybrid extension](https://developer.mozilla.org/en-US/Add-ons/WebExtensions/Embedded_WebExtensions). Once the legacy storage has been imported at first install by the thin legacy wrapper, uBO/webext will fully function as a pure webext extension despite the "Legacy" label.
The legacy storage is left untouched by uBO/webext, so you can always go back to uBO/legacy (stable release) if you do not want to use the webext version in the short term.
### Firefox for Android
As per [documentation](https://developer.mozilla.org/en-US/Add-ons/WebExtensions/Differences_between_desktop_and_Android), only with Firefox Mobile 55 (beta) you can access uBO's popup panel.
However it appears there is an issue with installing webext extensions on Firefox for Android 55, the browser thinks the extensions are corrupted -- this does not appear specific to uBO/webext. Consequently, for now it seems it's best to stick to uBO/legacy on Firefox for Android.
### Differences with uBO/legacy
- `script:contains` filters will stop working
- uBO's own filter lists have long ceased to rely on this filter syntax to solve reported filtering issues.
- ~~cosmetic filters will no longer use the browser's user styles~~ [Fixed with f32868766340e2fb8ec689f4b5683a413de847b6](https://github.com/gorhill/uBlock/commit/f32868766340e2fb8ec689f4b5683a413de847b6)
- uBO/webext has limited access to behind-the-scene network requests, unlike uBO/legacy which had full access to all behind-the-scene network requests. For example, you won't be able to see (and block) network requests made by other extensions.
### Future of uBO/legacy
For all those Firefox and Firefox-based browsers based on Firefox v53 and less, the dev channel of uBO will cease to work, and they will have to install manually the `xpi` version from the repo here if you want to keep using the dev version of uBO, or install the [stable version of uBO on AMO](https://addons.mozilla.org/en-US/firefox/addon/ublock-origin/).
As of writing, there is no plan to cease development of uBO/legacy. Hypothetically, this may change in some future if ever it becomes really non-trivial to keep a working the legacy version.
### Miscellaneous
[Issue #2795](https://github.com/gorhill/uBlock/issues/2795) will be a collection of [bugzilla.mozilla.org](https://bugzilla.mozilla.org/) issues which currently affect the uBO/webext specifically.