The difference was not 64bits vs 32bits, but request policy addon on the 64bits versions.
Even when set to let pass everything, request policy was interfering with uBlock.
uBlock is working ok now that request policy is deactivated.

When pressing on ublock origin in the drop down menu in Firefox 57.0a1 Android the page that opens shows a huge on off button and the text is large as well. I use the advanced mode and some settings is out of reach because it is too wide inside the page.
I use a Samsung galaxy tab pro 12.2 and most websites looks better in desktop mode on that screen size. So it would be great if ublock could fit in the page.
Otherwise ublock is a great addon that prevents lots of downloading of data from ads.

Just reporting that this version is indeed working with Firefox 56.0b8 (64 bit). Also, please reduce the size of the icon on the main toolbar. It was much smaller before multiprocessing.

Certainement le meilleur adblocker
Convivial et performant

Worked great until the last update. Now blocks nothing and the menu isn't accessible. Also disappears on restart of Firefox. Tried un- then reinstalling, no fix.

Usually very good. Works like a charm.

Then on the other hand. Strange hickups after automatic updates.
Right now version 1.14.8 stopped working with Firefox 56.0b8.
Deinstalling, installing. Nothing helps. The icon disapears from shortcuts bar and no settings are available. No adblocking at all.
Had to go back to version 1.13.8 (https://addons.mozilla.org/firefox/downloads/file/685614/ublock_origin-1.13.8-an+fx+sm+tb.xpi)

Any idea what might be the problem? How to solve this?

Blocks all ads effectively and does not engage in any blackmailing-like scheme in contrast to AdBlock Plus.

nice

This last version have some problem with Firefox 52 ESR (32bit), all the setting was erased... but i have imported everything with my uBlock backup. Unfortunately the Privacy options rest in "gray" and not selectable.

Fast ana Best

Als ich durch das letzte Firefoxupdate gezwungen war übergangsweise einen anderen Adblocker zu benutzen wurde mir erst wieder klar, was für ein perfekter Adblocker uBlock Origin doch ist.
Deshalb sah ich mich gezwungen dafür auch mal eine Bewertung zu hinterlassen.
Danke an den Entwickler.

Muy bueno

I'm using firefox 44.0.2 because it's the only one that complies
with the functionality of all my addons. nevertheless, with ubo,
when i open help and troubleshooting information,
firefox crashes with ubo enabled.

Do you have a version to advise me that would avoid it ?

Thanks

Ohne Worte