Feedback request: UX + performance review of two Manifest V3 extensions

[Salaria Labs]

Hi everyone,

I’m looking for feedback from experienced extension developers on a couple of small
Chrome extensions I built recently using Manifest V3.

Both were built to solve personal pain points, and I’m especially interested in
feedback around:
- MV3 best practices
- content script performance
- permissions scope
- UX/onboarding improvements

1) LinkedIn JobLens  
A client-side extension that filters LinkedIn job search results
(promoted jobs, Easy Apply roles, already-seen/applied jobs).
No scraping, no background polling — purely DOM-based filtering.

Chrome Web Store:
https://chromewebstore.google.com/detail/linkedin-joblens-%E2%80%94-smart/ffkelfoaaejkhdldmlbnglhpgpobiigp

2) ChatGPT Prompt Buttons  
A lightweight extension that adds reusable prompt buttons to ChatGPT
to avoid retyping common prompts. Uses local storage only.

Chrome Web Store:
https://chromewebstore.google.com/detail/chatgpt-prompt-buttons-%E2%80%93/ibpaonngaabikigmifpnajnnhoccmmbm

I’m not trying to promote these here — genuinely looking for guidance
from folks more experienced with Chromium extensions.

Any thoughts on architecture, UX tradeoffs, or things you’d do differently
would be really appreciated.

Thanks in advance,
Salaria Labs