Downloading web pages

Decades ago, browsers had features to download the current web page along with linked pages and store them locally including updating the downloaded main page's links to reference the linked copies. It was even possible to specify how many link levels to copy along with the main page. when web page sidebars became popular this became problematic for a while since sidebars often linked to ads or unrelated content (Wikipedia or GitHub for example). Then browsers started providing a means to disable webpage sidebars and display only the main page. I can't find any of that capability in Firefox. I have searched the settings, extensions, Firefox support pages and found almost nothing related to simply saving web pages. I fear that some day the website 'UESPWiiki' which provides support for my favorite game which is now (2025) 19 years old will some day go away. UESPWiki has side bars preventing simply downloading everything. Help.