Greasy Fork is available in English.
Change YouTube leftbar's subscription links to channel/user video page. This script can optionally also move updated links to top of the list (if there's enough space), optionally uncollapse all updated links which may extend the non collapsible links, and optionally display the number of updated & total links following the "SUBSCRIPTION" section label. All features can be enabled/disabled from the script code. For new YouTube layout only.
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What experimental flags are you referring to?
I should have been more clear, I meant while using this script or it's variant:
https://greasyfork.org/en/scripts/470428-youtube-experiment-flags-tamer
Firefox is slow to load on YouTube, and while I use a user agent string changer which helps quite a bit, using the script above makes loading pages MUCH faster. On it's own, loading up my subscription pages fully (ie: icons on sidemenu and watchlater/add to queue overlays) takes 10 seconds. With Chrome user agent, it takes maybe 6, but with the script above, it's 3 seconds.
But something in the script, one of the many flags it turns off, breaks your script completely.
It probably only affects a small fraction of users who notice, so not sure if it's worth your while to look into, esp. with Chrome being the larger user-base and most people not bothering to mess about with the above.
Is there any way to make this script compatible with experimental flags turned off on YouTube? YT itself is so much quicker/faster with them turned off, but it seems to completely bork your script.