Steps to replicate the issue:

• activate https://www.wikidata.org/wiki/User:Bargioni/moreIdentifiers.js with its configuration and/or https://www.wikidata.org/wiki/User:Bargioni/viaf.js in your common.js on Wikidata (https://www.wikidata.org/wiki/Special:MyPage/common.js)

importScript( 'User:Bargioni/moreIdentifiers defaultconf.js' );
importScript( 'User:Bargioni/moreIdentifiers.js' );
importScript( 'User:Bargioni/viaf.js' );

• load an item containing a VIAF ID (P214), e.g. https://www.wikidata.org/wiki/Q314447

What happens?:

• the content of the VIAF cluster(s) is not loaded in the box "Add More Identifiers from VIAF" (which is generated by moreIdentifiers.js)
• hovering on the VIAF ID(s) you don't see a preview of their content (which is generated by viaf.js)

What should have happened instead?:

• the content of the VIAF cluster(s) should be loaded in the box "Add More Identifiers from VIAF"
• hovering on the VIAF ID(s) a preview of their content should be seen

Cf. documentation https://www.wikidata.org/wiki/User:Bargioni/moreIdentifiers

Note: according to https://www.wikidata.org/wiki/Wikidata:Database_reports/Gadget_usage_statistics/wikidata moreIdentifiers is the most used common.js gadget in Wikidata, with 316 active users using it; it is highly relevant in the workflow of users involved in authority control activities

Probabile cause:
These userscripts load data from viaf.org; a few hours ago most userscripts were reenabled (cf. T419154); however, I think gagets loading data from non-Wikimedia websites might be affected by "some hopefully-not-too-intrusive, temporary restrictions" (cf. T419154#11679745); since I haven't found a public ticket about these restrictions, I open this