2.57.1

• Added the X-Competitive-Companion header to HTTP requests sent by Competitive Companion to indicate to the receiving end that the request is coming from Competitive Companion (thanks @touhidurrr)

2.57.0

• Added support for CYEZOJ, 33OJ, Algotester, and SeriousOJ (thanks @langningchen for the CYEZOJ support)
• Fixed using the Hydro and DMOJ parsers on unsupported websites through the "Parse with" functionality and in custom rules
• Fixed the BAPS OJ problem parser and added a contest parser (thanks @touhidurrr)
• Fixed the yukicoder contest parser

2.56.0

• Added support for QBXTOJ and Universal Cup (thanks @touhidurrr for the QBXTOJ parser)
• Added support for LightOJ contests (thanks @touhidurrr)
• Fixed the Eolymp Basecamp parser (thanks @touhidurrr)

2.55.0

• Added support for oiClass, Le Quy Don Online Judge, VNOI Online Judge, and NBUT Online Judge
• Added support for the Challenge mode on Kattis
• Fixed the Timus Online Judge parser to work with the acm-judge.urfu.ru domain
• Fixed the Toph parser (thanks @touhidurrr)
• Fixed the AlgoZenith parser
• Fixed the Virtual Judge contest parser

2.54.0

• Added support for QQWhale
• Added support for the "Complete problemset" pages in Codeforces contests
• Improved performance of sending contest problems to external tools by sending them in parallel (thanks @rsalesc)
• Fixed the parsing of ACMP sample cases with mid-line whitespaces (thanks @touhidurrr)
• Fixed the Toph parser
• Fixed the input/output parsing on certain Codeforces problems

2.53.0

• Added support for Kilonova, PBInfo, InfoArena, and NerdArena (thanks @overanalytcl)
• Added support for parsing sample cases on UVA and UVALive problems on Virtual Judge (does not work on Firefox until Firefox bug #1757836 is resolved)
• Fixed the parsing of Virtual Judge sample cases on Chinese problems
• Fixed the parsing of Virtual Judge titles containing unwanted whitespace

2.52.1

• Fixed the parsing of TLX problems (thanks @adrieljss)
• Fixed the parsing of CodeChef problems

2.52.0

• Added support for Lanqiao (thanks @touhidurrr for the problem parser)
• Added support for Eolymp Basecamp (thanks @touhidurrr for the problem parser)
• Added support for the vjudge.net.cn Virtual Judge mirror (thanks @touhidurrr)
• Fixed the parsing of PTA problems (thanks @touhidurrr)
• Fixed the parsing of TLX problems (thanks @touhidurrr)

2.51.1

• Fixed the parsing of AlgoZenith problems on its maang.in website (thanks @rohitzerofour)
• Fixed the parsing of Baekjoon Online Judge problems in active contests
• Fixed the parsing of certain Mendo problems

2.51.0

• Removed the Baekjoon Online Judge contest parser because Baekjoon Online Judge has started to block requests to their problems made through the browser's Fetch API
• Fixed the parsing of USACO problems