I have an account on one server, but often browser from 9 other servers.

Do you literally open 9 tabs for each instances? If that’s the case, that’s kinda weird. You don’t have to. That’s the whole point of Lemmy.

Link for a community in lemmy should be something like this: [Link Text](/c/communityName@instance.host). If you click that in whatever instance you’re in, you should be able to access the community in that instance.

However, quite a lot of people just don’t care and copy/paste link for the community which is (understandable, but,) quite irritating. So after I read this post I just wrote this hacky Tampermonkey script to fix those links.

// ==UserScript==
// @name         Fix community link
// @version      0.1
// @match        https://[YOUR INSTANCE HERE]/post/*
// @run-at       document-end
// ==/UserScript==

(function() {
    'use strict';
    const postLinks = document.getElementById("postContent").querySelectorAll("a:not(.community-link)");
    const comments = document.getElementsByClassName("comment-content");

    for (let aTag of postLinks) {
        const isCommunityLink = aTag.pathname.startsWith("/c/");
        aTag.href = isCommunityLink?aTag.pathname + "@" + aTag.host:aTag.href;
    };
    for (let comment of comments) {
        let commentLinks = comment.querySelectorAll("a:not(.community-link)");
        for (let aTag of commentLinks) {
            const isCommunityLink = aTag.pathname.startsWith("/c/");
            aTag.href = isCommunityLink?aTag.pathname + "@" + aTag.host:aTag.href;
        };
    };
})();

It’s very far from being pretty (I especially hate how isCommunityLink works) so let me know if there’s a better way I can do this!