There are tons of helpful browser plugins out there and it might be a matter of personal taste what you like to have installed. The following are explicitly worth to mention:
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DarkReader - for developers enjoying dark-mode (and get eye-cancer from white backgrounds)
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TamperMonkey - even though not recommended to be always on for security reasons this is the ultimate swiss-army-knife of every web-developer.
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FF only: Simple Tab Groups - only for power-users that need to manage 100+ open tabs in multi-tenancy contexts (project A, project B, timetracking, travel, etc.).
For the record: HttpsEverywhere is dead since now there is native browser support for HTTPS only.
To draw diagrams for your project or for blueprints in devonfw, we recommend the following cross-platform tools:
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draw.io is a powerful generic vector painting program (similar to visio). You can get a free open-source edition for your desktop from here.
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PlantUML is a great tool that can render UML diagrams from simple markup that can be easily managed in git or other version-control systems together with your code. Its simplicity allows branching and merging unlike other greedy binary UML data-formats.
If you are looking for a git client that works cross-platform we recommend to use Fork.