Very simple, from the source:

Lemmy Universal Link Switcher, or LULs for short, scans all links on all websites, and if any link points to a Lemmy instance that is not your main/home instance, it rewrites the link so that it instead points to your main instance.

In essence, any Lemmy link you come across is automatically redirected to your home instance. It's also easy to customise, you can add/remove instances and prevent it from working on particular sites (or force it to only work on sites you wish).

Can be installed with Tampermonkey or ViolentMonkey (or similar tools).

note: this may also work just fine on mobile browsers that support extensions (and would likely help direct your browser to opening your lemmy app - if you have one - more often), but I haven't tested this.

cross-posted from: https://lemm.ee/post/1606937

If you didn't already know about it, I included the full description after the release notes.

Release 1.3.0

• You can now add multiple secondary instances: so if you, like me, also have an account on lemmynsfw.com (or of course any other instance), you can add that there and not have links rewritten for that instance
• You can manually enter your home instance. Useful for self-hosted instances that didn't show up in my instance list.

Full Description Below:

Description

Lemmy Universal Link Switcher, or LULs for short, scans all links on all websites, and if any link points to a Lemmy instance that is not your main/home instance, it rewrites the link so that it instead points to your main instance.

Also works on Firefox Android with the Tampermonkey extension!

Features

• Rewrite links to Lemmy posts/comments to point to your home instance. Only after hovering over them, because getting home posts/comments links require communicating with the Lemmy servers, and we don't want to spam the servers.
  

• Instantly rewrite all links of community or user links to Lemmy/kbin on all websites everywhere to your new instance! The rewritten links will have an icon next to it, and hovering/touching the icon will show you the original link, allowing you to go there if you want to.
  

• If you are already on a page that has a corresponding page on your home instance, a link will automatically be added to the page header.
  

Home Instance Setup

Simply visit the Lemmy instance you want to set as your home while the script is active. You will be asked if you want to set this instance to your home instance:

Settings

If you want to change your home instance or add secondary instances in case you have multiple accounts, simply go to the script settings, accessible within Violent/Tampermonkey directly, or alternatively within any Lemmy instances' settings.

Common Issues

• Does not work with Greasemonkey. Use Violentmonkey (open source) or Tampermonkey (closed source) instead.

Coming soon

• Rewrite kbin post/comment links
• Better rewriting support for kbin community/user urls (e.g. sort options are currently ignored)
• Nicer tooltip styling (fit into page theme)
• Signify that "Show at home" button is loading for posts/comments
• Integrate with lmmy.to redirector

If you didn't already know about it, I included the full description after the release notes.

Release 1.3.0

• You can now add multiple secondary instances: so if you, like me, also have an account on lemmynsfw.com (or of course any other instance), you can add that there and not have links rewritten for that instance
• You can manually enter your home instance. Useful for self-hosted instances that didn't show up in my instance list.

Full Description Below:

Description

Lemmy Universal Link Switcher, or LULs for short, scans all links on all websites, and if any link points to a Lemmy instance that is not your main/home instance, it rewrites the link so that it instead points to your main instance.

Also works on Firefox Android with the Tampermonkey extension!

Features

• Rewrite links to Lemmy posts/comments to point to your home instance. Only after hovering over them, because getting home posts/comments links require communicating with the Lemmy servers, and we don't want to spam the servers.
  

• Instantly rewrite all links of community or user links to Lemmy/kbin on all websites everywhere to your new instance! The rewritten links will have an icon next to it, and hovering/touching the icon will show you the original link, allowing you to go there if you want to.
  

• If you are already on a page that has a corresponding page on your home instance, a link will automatically be added to the page header.
  

Home Instance Setup

Simply visit the Lemmy instance you want to set as your home while the script is active. You will be asked if you want to set this instance to your home instance:

Settings

If you want to change your home instance or add secondary instances in case you have multiple accounts, simply go to the script settings, accessible within Violent/Tampermonkey directly, or alternatively within any Lemmy instances' settings.

Common Issues

• Does not work with Greasemonkey. Use Violentmonkey (open source) or Tampermonkey (closed source) instead.

Coming soon

• Rewrite kbin post/comment links
• Better rewriting support for kbin community/user urls (e.g. sort options are currently ignored)
• Nicer tooltip styling (fit into page theme)
• Signify that "Show at home" button is loading for posts/comments
• Integrate with lmmy.to redirector

Release 1.3.0

• You can now add multiple secondary instances: so if you, like me, also have an account on lemmynsfw.com (or of course any other instance), you can add that there and not have links rewritten for that instance
• You can manually enter your home instance. Useful for self-hosted instances that didn't show up in my instance list.

Full Description Below:

Description

Lemmy Universal Link Switcher, or LULs for short, scans all links on all websites, and if any link points to a Lemmy instance that is not your main/home instance, it rewrites the link so that it instead points to your main instance.

Also works on Firefox Android with the Tampermonkey extension!

Features

• Rewrite links to Lemmy posts/comments to point to your home instance. Only after hovering over them, because getting home posts/comments links require communicating with the Lemmy servers, and we don't want to spam the servers.
  

• Instantly rewrite all links of community or user links to Lemmy/kbin on all websites everywhere to your new instance! The rewritten links will have an icon next to it, and hovering/touching the icon will show you the original link, allowing you to go there if you want to.
  

• If you are already on a page that has a corresponding page on your home instance, a link will automatically be added to the page header.
  

Home Instance Setup

Simply visit the Lemmy instance you want to set as your home while the script is active. You will be asked if you want to set this instance to your home instance:

Settings

If you want to change your home instance or add secondary instances in case you have multiple accounts, simply go to the script settings, accessible within Violent/Tampermonkey directly, or alternatively within any Lemmy instances' settings.

Common Issues

• Does not work with Greasemonkey. Use Violentmonkey (open source) or Tampermonkey (closed source) instead.

Coming soon

• Rewrite kbin post/comment links
• Better rewriting support for kbin community/user urls (e.g. sort options are currently ignored)
• Nicer tooltip styling (fit into page theme)
• Signify that "Show at home" button is loading for posts/comments
• Integrate with lmmy.to redirector

Usando lo user script Lemmy Universal Link Switcher ogni link alle varie istanze di lemmy conosciute verrà trasformato nel suo permalink verso feddit.it (o qualsiasi altro da voi scelto), assicurandovi di essere sempre loggati con il vostro account!

This script transforms links from other instances to your home instance. So useful :)

As @MedicareForSome@lemmy.ml explained:

It makes it so that if you visit another instance using their URL, it will redirect you to your home version’s federated link.

E.g. if your home server is Lemmy.world, let’s say you find a link to Lemmy on another website but it’s a link to Lemmy.ml. If you click the link, you won’t be signed in.

So like:

https://lemmy.ml/c/memes would redirect to https://lemmy.world/c/memes@lemmy.ml

This way you can seamlessly use Lemmy.

It does the same for posts.

Edit: since it works from any site, I highly recommend you to add it to your Android browser so it will work with webapp clients here's how:

You can use violentMonkey on ff browser too, but you need to unlock Dev options, then do this

Description

Lemmy Universal Link Switcher, or LULs for short, scans all links on all websites, and if any link points to a Lemmy instance that is not your main/home instance, it rewrites the link so that it instead points to your main instance.

Also works on Firefox Android with the Tampermonkey extension!

Features

• Rewrite links to Lemmy posts/comments to point to your home instance. Only after hovering over them, because getting home posts/comments links require communicating with the Lemmy servers, and we don't want to spam the servers.
  

• Instantly rewrite all links of community or user links to Lemmy/kbin on all websites everywhere to your new instance! The rewritten links will have an icon next to it, and hovering/touching the icon will show you the original link, allowing you to go there if you want to.
  

• If you are already on a page that has a corresponding page on your home instance, a link will automatically be added to the page header.
  

Home Instance Setup

Simply visit the Lemmy instance you want to set as your home while the script is active. You will be asked if you want to set this instance to your home instance:

If you initially set your home instance wrong or just want to change it, no worries - simply go to your settings on your new home instance and press the button for it!

Common Issues

• Does not work with Greasemonkey. Use Violentmonkey (open source) or Tampermonkey (closed source) instead.

Coming soon

• Rewrite kbin post/comment links
• Better rewriting support for kbin community/user urls (e.g. sort options are currently ignored)
• Nicer tooltip styling (fit into page theme)
• Signify that "Show at home" button is loading for posts/comments

Please report issues with this version either here or at the issue tracker.

Changelog v1.2.0

• Add rewrite support for posts/comments
  
• Try to not rewrite federation links

Description

Lemmy Universal Link Switcher, or LULs for short, scans all links on all websites, and if any link points to a Lemmy instance that is not your main/home instance, it rewrites the link so that it instead points to your main instance. Currently only works for community/user links.

Also works on Firefox Android with the Tampermonkey extension!

Features

• Rewrite links to Lemmy posts/comments to point to your home instance. Only after hovering over them, because getting home posts/comments links require communicating with the Lemmy servers, and we don't want to spam the servers.
  

• Instantly rewrite all links of communities or users to Lemmy/kbin on all websites everywhere to your new instance! The rewritten links will have an icon next to it, and hovering/touching the icon will show you the original link, allowing you to go there if you want to.
  

• If you are already on a page that has a corresponding page on your home instance, a link will automatically be added to the page header.
  

Home Instance Setup

Simply visit the Lemmy instance you want to set as your home while the script is active. You will be asked if you want to set this instance to your home instance:

If you initially set your home instance wrong or just want to change it, no worries - simply go to your settings on your new home instance and press the button for it!

Coming soon

• Rewrite kbin post/comment links
• Better rewriting support for kbin community/user urls (e.g. sort options are currently ignored)
• Nicer tooltip styling (fit into page theme)
• Signify that "Show at home" button is loading for posts/comments

Description

Lemmy Universal Link Switcher, or LULs for short, scans all links on all websites, and if any link points to a Lemmy instance that is not your main/home instance, it rewrites the link so that it instead points to your main instance. Currently only works for community/user links.

Home Instance Setup

Simply visit the Lemmy instance you want to set as your home while the script is active. You will be asked if you want to set this instance to your home instance:

If you initially set your home instance wrong or just want to change it, no worries - simply go to your settings on your new home instance and press the button for it!

Features

• Rewrite all links of communities or users on all websites everywhere to your new instance! The rewritten links will have an icon next to it, and hovering/touching the icon will show you the original link, allowing you to go there if you want to.
  

• If you are already on a page that has a corresponding page on your home instance, a link will automatically be added to the page header.
  

Coming soon

• Post & comment links. Those are a bit harder because the URL has to be requested from the instances.

Repository & Issues