firefox: added to-deepl extension

wiki/firefox.md

@@ -47,15 +47,16 @@ They can be removed and configured under `about:config`.
   frontends.
 - [Sidebery](https://addons.mozilla.org/en-GB/Firefox/addon/sidebery)
   is a sidebar with treestyle tabs and bookmarks.
-- [SponsorBlock](https://addons.mozilla.org/en-US/firefox/addon/sponsorblock/)
+- [SponsorBlock](/wiki/youtube.md#automatically-skip-sponsorships) skips YouTube video sponsors
-  skips YouTube video sponsors automatically, works with
+  automatically, works with [Invidious](./invidious.md) too.
-  [invidious](./invidious.md) too.
 - [Tampermonkey](https://github.com/Tampermonkey/tampermonkey) is a userscript
   manager that can be used for the following tasks:
   - [Bypass YouTubes age restrictions](https://github.com/zerodytrash/Simple-YouTube-Age-Restriction-Bypass)
   - [Exclude pages from](http://www.jeffersonscher.com/gm/google-hit-hider/)
     [search results](/wiki/search_engine.md)
   - [Auto close YouTube ads](https://greasyfork.org/en/scripts/9165-auto-close-youtube-ads)
+- [To DeepL translation](https://addons.mozilla.org/en-US/firefox/addon/to-deepl/) gives an option
+  for marked text to display its translation in a pop-up window using DeepL.
 - [Tree Style Tab](https://addons.mozilla.org/en-GB/Firefox/addon/tree-style-tab)
   shows tabs like a tree. This is especially useful if many tabs are used.
 - [uBlock Origin](https://addons.mozilla.org/en-GB/Firefox/addon/ublock-origin)

wiki/invidious.md

@@ -1,7 +1,7 @@
 # Invidious
 
 [Invidious](https://github.com/iv-org/invidious) is an alternative frontend for
-YouTube.
+[YouTube](/wiki/youtube.md).
 It includes locally stored subscription management.
 
 ## Setup
@@ -23,9 +23,7 @@ or [privacy redirect](https://addons.mozilla.org/en-US/firefox/addon/privacy-red
 For Android there is
 [the UntrackMe app](https://framagit.org/tom79/nitterizeme) (available at [f-droid](./android/f-droid.md)).
 
-### Skip sponsorships in videos
+### Automatically Skip Sponsorships
 
-When using [Firefox](./firefox.md) SponsorBlock can be installed.
+[In the YouTube article](/wiki/youtube.md#automatically-skip-sponsorships) a section discusses the
-This will skip YouTube video sponsors in YouTube and in Invidious.
+skipping of sponsorships that is compatible with Invidious too.
-Further informations and links can be found in the
-[Firefox entry of this wiki](./firefox.md#list-of-useful-firefox-addons).

wiki/youtube.md

@@ -21,3 +21,10 @@ Since yt-dl is stagnant its fork [yt-dlp](https://github.com/yt-dlp/yt-dlp) is
 recommended.
 [MeTube](/wiki/metube.md) is a self-hostable web user interface for
 [yt-dlp](https://github.com/yt-dlp/yt-dlp).
+
+## Automatically Skip Sponsorships
+
+[SponsorBlock](https://github.com/ajayyy/SponsorBlock) is a [browser](/wiki/web_browser.md)
+expansion.
+It is used to skip sponsorships, paid and unpaid promotions and other labelled data on YouTube and
+[Invidious](/wiki/invidious.md).