Hi all!
This bug concerns the XWiki extension “Favorites Application”.
If the page URL contains < or > characters, the “Add this page” button in the “My Favorites” panel displays text and does not work:
I created a Jira ticket about this bug: XFAV-16
But maybe this can be fixed manually in XWiki?
It should be possible to fix it manually on your wiki. 
It looks like there’s some escaping missing at application-favorites/src/main/resources/Favorites/Code/FavoritesPanel.xml at 98961ba22cc3d7486586acb74172c31d8bc65a01 · xwiki-contrib/application-favorites · GitHub . In order to fix it yourself, you first need to make sure you can see hidden pages (x+x+x+h to toggle it), then search on your wiki for the page titled FavoritesPanel
. Then edit the content of the panel and add some escaping.
… Just checked the Git blame on the codebase, and it seems like @acotiuga already fixed it 
So you can either wait for the next release of the extension, or add the escaping in your own wiki panel content right now just like he did in the codebase 
Have a great day!
Lucas C.
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The reported issue is fixed now and a new version of the application was released. Just upgrade to version 1.2.5
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Wow, how cool! Yes, updating to version 1.2.5 worked! ))
@acotiuga, thank you for solving this problem so quickly! You helped a lot!