A quick search for “net::ERR_BLOCKED_BY_CLIENT” and JavaScript mention AdBlock clients may block Twitter’s JavaScript.
Adding an Easylist filter list subscription to your ad blocker configuration may block Twitter’s widget JavaScript from loading in your browser.
https://hg.adblockplus.org/easylist/file/10ab31cd7d06/easylist/easylist_specific_block.txt
Adding an exception rule through your ad blocking software’s should allow you to override the choices made by your subscribed, auto-updating filter list. Examples for Adblock Plus:
https://adblockplus.org/en/filters#whitelist
https://adblockplus.org/en/filter-cheatsheet#exceptions2
Based on those documents the following additional filter should allow platform.twitter.com content:
@@||platform.twitter.com^
You may attach an event to the script element or the resource loader on your page to detect when Twitter’s widgets JavaScript has loaded or has failed to load within your expected timeframe.
https://html.spec.whatwg.org/multipage/indices.html#event-load
If your webpage uses JavaScript factory functions you may want to insert your own fallback content or message in the expected render area if the JavaScript fails to load.
Note: Twitter’s JavaScript may fail to load for reasons similar to an ad blocker such as an entire country blocking access to Twitter.
