Reusing browser profiles across automation runs seems efficient—until it quietly breaks your tests.
I learned this the hard way: after dozens of runs with the same profile, mysterious failures started appearing. Slow page loads. Invalid sessions. Form fields auto-filling with stale data from previous runs. The culprit? Accumulated cookies, localStorage, and cached credentials polluting each new session.
Browser profiles aren't designed for infinite reuse. Extensions update silently, storage bloats, and state leaks between runs. Worse, these issues manifest sporadically—making debugging a nightmare.
The fix is simple: rotate profiles or reset state between runs. Use fresh directories for each session, clear storage programmatically, or isolate with incognito modes. Treat profiles as disposable infrastructure, not persistent workspaces.
One clean profile per run eliminates an entire class of flaky tests.
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