I asked a very similar question before: Select and copy part of the text from a link in Safari
How can I copy only a section of text from a hyper link? For example in google results:
How can I copy "Inosuke Hashibira" from that link?
Previously, the only solution was to use a custom extension or userscript.
Now two years have passed, and I can't figure out how to add custom extensions anymore. I also don't really want to go through all the trouble of installing a userscript manager just for this, especially since Safari's not very friendly to extension developers and often breaks them every update, and (probably because of this) developers don't seem to care for supporting Safari.
How can I select part of a link in Safari nowadays?