Text to Speech od Francesco De Stefano

This extension or add-on implements the context menu with a useful command that lets you listen to the voice of the selected text.
Mini tut on YouTube - click here
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Release 1.5.0
Text to Speech is in sidebar. Open sidebar Text to Speech, from main menu: View->sidebar, select text with context menu from web page to listen.
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Text to speech voices available in macOS:

• Alex (en-US)
• Alice (it-IT)
• Alva (sv-SE)
• Amelie (fr-CA)
• Anna (de-DE)
• Carmit (he-IL)
• Damayanti (id-ID)
• Daniel (en-GB)
• Diego (es-AR)
• Ellen (nl-BE)
• Fiona (en-scotland)
• Fred (en-US)
• Ioana (ro-RO)
• Joana (pt-PT)
• Jorge (es-ES)
• Juan (es-MX)
• Kanya (th-TH)
• Karen (en-AU)
• Kyoko (ja-JP)
• Laura (sk-SK)
• Lekha (hi-IN)
• Luca (it-IT)
• Luciana (pt-BR)
• Maged (ar-SA)
• Mariska (hu-HU)
• Mei-Jia (zh-TW)
• Melina (el-GR)
• Milena (ru-RU)
• Moira (en-IE)
• Monica (es-ES)
• Nora (nb-NO)
• Paulina (es-MX)
• Samantha (en-US)
• Sara (da-DK)
• Satu (fi-FI)
• Sin-ji (zh-HK)
• Tessa (en-ZA)
• Thomas (fr-FR)
• Ting-Ting (zh-CN)
• Veena (en-IN)
• Victoria (en-US)
• Xander (nl-NL)
• Yelda (tr-TR)
• Yuna (ko-KR)
• Yuri (ru-RU)
• Zosia (pl-PL)
• Zuzana (cs-CZ)