User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0 Build ID: 20170730100307 Steps to reproduce: 1. Enable stylo 2. install ABP Go to http://www.digitaljournal.com/tech-and-science/technology/a-step-closer-to-skynet-ai-invents-a-language-humans-can-t-read/article/498142 Actual results: Site keeps on loading, CPU usage is 100% If you switch to another tab and then switch to this one, you will see a spinner Expected results: Not so

I'll attempt to reproduce.

I am on Win10x64, with OOP-Webextensions enabled by default. That might be a factor in reproducing. Also, you might try using the filter list from here: https://bugzilla.mozilla.org/attachment.cgi?id=8890882 if the default filter list in ABP does not reproduce.

OK, I confirmed this. So basically with Stylo+ABP, Nightly has two behaviors for this bug: 1. If the filter list is default that comes preloaded with ABP, then browser shows same behaviour as bug 1384945 2. If filter list is huge, as https://bugzilla.mozilla.org/attachment.cgi?id=8890882 this, then the browser shows the behavior described in comment 0 ni? so that you can see my findings.

My filter list. Using this in ABP will reproduce behavior of comment 0

(In reply to Mayank Bansal from comment #0) > 1. Enable stylo > 2. install ABP I'm assuming you have installed the stable or dev version (both legacy) from https://addons.mozilla.org/firefox/addon/adblock-plus/ ? (I am just a Nightly user) Today is the birth of Firefox 57 and it won't support Legacy extensions, so I would request the Stylo people to only focus on webextension (or system addon) performance. https://downloads.adblockplus.org/devbuilds/adblockplusfirefox/ If you've tested the webextension: Do you see the same behavior there? (If you haven't, could you please? :D) (If you are using ABP personally, I would like to suggest you uBlock Origin https://github.com/gorhill/uBlock/releases)

I can't reproduce either this nor bug 1384945 with ABP's webext on Debian testing. CPU is the same, RAM not that higher. Everything is smooth. Maybe this is architecture- or OS-specific?

(In reply to Mayank Bansal from comment #4) > Created attachment 8892458 [details] > MyFilters.ini > > My filter list. Using this in ABP will reproduce behavior of comment 0 Thank you for this. I can't figure out how to import your .ini file. I attempted to Add filter subscription -> Add a different subscription... and then put the file:// URL to the .ini file, but that was rejected with "Filter list location is neither a valid URL nor a valid file name." How do I import it?

I cant reproduce this bug anymore. I dont know if things changed in Stylo or ABP. Please close this bug (and its dependent bug) appropriately.

(In reply to Mayank Bansal from comment #8) > I cant reproduce this bug anymore. I dont know if things changed in Stylo > or ABP. > Please close this bug (and its dependent bug) appropriately. Thanks!