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Updated Firefox WebExtensions (markdown)

Raymond Hill 2017-09-27 07:40:56 -04:00
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Firefox-WebExtensions.md

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### Read carefully if using uBO/webext
There are many [reports](http://forums.mozillazine.org/viewtopic.php?p=14764474#p14764474) of people experiencing issues with some web sites, or images not loading, etc. Turns out many of these are a result of using some legacy extensions along uBO/webext. For instance, Reek's AAK in [GreaseMonkey](https://www.reddit.com/r/uBlockOrigin/comments/6xl3em/image_links_suddenly_blocked_by_ublock_origin/) has been [causing](https://www.reddit.com/r/firefox/comments/6x8hbe/ublock_origin_is_a_webextension_in_amo_stable/dmf6j5k/) issues with images not loading.
If you experience such issue, you will have to disable all your legacy extensions and see if this fixes your issue. If so, then you will have to re-enable your legacy extension one by one to find the one(s) causing the problem.
Those legacy extensions can cause multi-process to be disabled in your browser, and apparently when multi-process is disabled, this can cause many cases of [page load failure](https://bugzilla.mozilla.org/show_bug.cgi?id=1348497#c27).
Everything is moving to WebExtensions, so it might be just a good time to start giving up on legacy extensions, they are not going to be supported at all in a couple of weeks when Firefox 57 is released.
There are also Firefox issues specific to webext extensions which can cause a web page to load improperly:
- [Extension with listener at webRequest.onHeadersReceived breaks navigation (crash/blank page) when the previous page performs sync XHR upon unload](https://bugzilla.mozilla.org/show_bug.cgi?id=1401516)
- [Empty page using uBo / ABP webext (even whitelisting the site)](https://bugzilla.mozilla.org/show_bug.cgi?id=1396226)
- [Presence of an Webextension makes the head element missing on (iframe) load](https://bugzilla.mozilla.org/show_bug.cgi?id=1375875)
Another option is to install [uBO 1.13.8](https://addons.mozilla.org/en-US/firefox/addon/ublock-origin/versions/?page=1#version-1.13.8) and disable auto-update for it.
***
### Tentative schedule
(This needs to be updated -- there might be obsolete information below)
This page may update often until there is a stable release of uBO/webext.
| Tentative schedule | July 19 | Aug. 10 | Aug. 22 | Sep. 19 | Nov. 14 |