You can read up on the background of this update here: https://adblockplus.org/blog/the-plan-towards-offering-adblock-plus-for-firefox-as-a-web-extension. If you have issues, our forums is where you can get help.

You can read up on the reasons here: https://adblockplus.org/blog/the-plan-towards-offering-adblock-plus-for-firefox-as-a-web-extension

You can read up on the reasons here: https://adblockplus.org/blog/the-plan-towards-offering-adblock-plus-for-firefox-as-a-web-extension

You can read up on the reasons here: https://adblockplus.org/blog/the-plan-towards-offering-adblock-plus-for-firefox-as-a-web-extension

You can read up on the background here: https://adblockplus.org/blog/the-plan-towards-offering-adblock-plus-for-firefox-as-a-web-extension. As to blockable items, this was replaced by a Developer Tools panel - press Ctrl+Shift+I (Cmd+Option+I on macOS) to open Developer Tools, then switch to the Adblock Plus panel. You might need to reload the page, requests performed before the panel was opened aren't being displayed.

We are aware of the issue with the Block Element dialog and are investigating it. You should expect it to be addressed with a follow-up release soon. You can still add any filter list you want, nothing changed here (you can use the links on https://adblockplus.org/subscriptions for example). As to missing translations, everybody is free to help out with those on https://crowdin.com/project/adblockpluschrome and https://crowdin.com/project/adblockplusui (strangely, French is supposed to be 100% translated).

That appears to be an issue with the Firefox theme you are using. It's a generic icon badge, we don't determine its color. For me, it's perfectly readable.